diff --git a/.travis.yml b/.travis.yml
index e2da16e..24d1b65 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,6 @@
 language: php
 
 php:
-  - '5.5'
   - '5.6'
   - '7.0'
   - '7.1'
@@ -11,7 +10,6 @@ matrix:
   allow_failures:
     - php: nightly
 
-
 before_script:
   - composer install --dev --prefer-source
 
diff --git a/composer.json b/composer.json
index ca9c7b5..d2089ca 100644
--- a/composer.json
+++ b/composer.json
@@ -17,7 +17,7 @@
         "league/commonmark": "^0.15",
         "league/plates": "~3.1",
         "myclabs/deep-copy": "^1.5",
-        "php": ">=5.5",
+        "php": ">=5.6",
         "symfony/console": "~3.0",
         "symfony/finder": "~3.0",
         "webuni/commonmark-table-extension": "0.6.*",
@@ -30,7 +30,7 @@
         }
     },
     "require-dev": {
-        "phpunit/phpunit": "~4",
+        "phpunit/phpunit": "~5",
         "mikey179/vfsStream": "^1.6"
     }
 }
diff --git a/composer.lock b/composer.lock
index 24d76ba..5229711 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
         "This file is @generated automatically"
     ],
-    "content-hash": "05241ccdc78029e6cab7373c6fa3af99",
+    "content-hash": "89c196ac8c5858ac075e9a7eccadbf1a",
     "packages": [
         {
             "name": "guzzlehttp/guzzle",
@@ -121,16 +121,16 @@
         },
         {
             "name": "guzzlehttp/psr7",
-            "version": "1.4.1",
+            "version": "1.4.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/guzzle/psr7.git",
-                "reference": "0d6c7ca039329247e4f0f8f8f6506810e8248855"
+                "reference": "f5b8a8512e2b58b0071a7280e39f14f72e05d87c"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/guzzle/psr7/zipball/0d6c7ca039329247e4f0f8f8f6506810e8248855",
-                "reference": "0d6c7ca039329247e4f0f8f8f6506810e8248855",
+                "url": "https://api.github.com/repos/guzzle/psr7/zipball/f5b8a8512e2b58b0071a7280e39f14f72e05d87c",
+                "reference": "f5b8a8512e2b58b0071a7280e39f14f72e05d87c",
                 "shasum": ""
             },
             "require": {
@@ -182,20 +182,20 @@
                 "uri",
                 "url"
             ],
-            "time": "2017-02-27T10:51:17+00:00"
+            "time": "2017-03-20T17:10:46+00:00"
         },
         {
             "name": "league/commonmark",
-            "version": "0.15.3",
+            "version": "0.15.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/thephpleague/commonmark.git",
-                "reference": "c8b43ee5821362216f8e9ac684f0f59de164edcc"
+                "reference": "c4c8e6bf99e62d9568875d9fc3ef473fe3e18e0c"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/thephpleague/commonmark/zipball/c8b43ee5821362216f8e9ac684f0f59de164edcc",
-                "reference": "c8b43ee5821362216f8e9ac684f0f59de164edcc",
+                "url": "https://api.github.com/repos/thephpleague/commonmark/zipball/c4c8e6bf99e62d9568875d9fc3ef473fe3e18e0c",
+                "reference": "c4c8e6bf99e62d9568875d9fc3ef473fe3e18e0c",
                 "shasum": ""
             },
             "require": {
@@ -251,7 +251,7 @@
                 "markdown",
                 "parser"
             ],
-            "time": "2016-12-19T00:11:43+00:00"
+            "time": "2017-05-09T12:47:53+00:00"
         },
         {
             "name": "league/plates",
@@ -310,16 +310,16 @@
         },
         {
             "name": "myclabs/deep-copy",
-            "version": "1.6.0",
+            "version": "1.6.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/myclabs/DeepCopy.git",
-                "reference": "5a5a9fc8025a08d8919be87d6884d5a92520cefe"
+                "reference": "8e6e04167378abf1ddb4d3522d8755c5fd90d102"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/5a5a9fc8025a08d8919be87d6884d5a92520cefe",
-                "reference": "5a5a9fc8025a08d8919be87d6884d5a92520cefe",
+                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/8e6e04167378abf1ddb4d3522d8755c5fd90d102",
+                "reference": "8e6e04167378abf1ddb4d3522d8755c5fd90d102",
                 "shasum": ""
             },
             "require": {
@@ -348,7 +348,7 @@
                 "object",
                 "object graph"
             ],
-            "time": "2017-01-26T22:05:40+00:00"
+            "time": "2017-04-12T18:52:22+00:00"
         },
         {
             "name": "psr/http-message",
@@ -449,16 +449,16 @@
         },
         {
             "name": "symfony/console",
-            "version": "v3.2.4",
+            "version": "v3.3.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/console.git",
-                "reference": "0e5e6899f82230fcb1153bcaf0e106ffaa44b870"
+                "reference": "70d2a29b2911cbdc91a7e268046c395278238b2e"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/console/zipball/0e5e6899f82230fcb1153bcaf0e106ffaa44b870",
-                "reference": "0e5e6899f82230fcb1153bcaf0e106ffaa44b870",
+                "url": "https://api.github.com/repos/symfony/console/zipball/70d2a29b2911cbdc91a7e268046c395278238b2e",
+                "reference": "70d2a29b2911cbdc91a7e268046c395278238b2e",
                 "shasum": ""
             },
             "require": {
@@ -466,10 +466,16 @@
                 "symfony/debug": "~2.8|~3.0",
                 "symfony/polyfill-mbstring": "~1.0"
             },
+            "conflict": {
+                "symfony/dependency-injection": "<3.3"
+            },
             "require-dev": {
                 "psr/log": "~1.0",
+                "symfony/config": "~3.3",
+                "symfony/dependency-injection": "~3.3",
                 "symfony/event-dispatcher": "~2.8|~3.0",
                 "symfony/filesystem": "~2.8|~3.0",
+                "symfony/http-kernel": "~2.8|~3.0",
                 "symfony/process": "~2.8|~3.0"
             },
             "suggest": {
@@ -481,7 +487,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "3.2-dev"
+                    "dev-master": "3.3-dev"
                 }
             },
             "autoload": {
@@ -508,20 +514,20 @@
             ],
             "description": "Symfony Console Component",
             "homepage": "https://symfony.com",
-            "time": "2017-02-16T14:07:22+00:00"
+            "time": "2017-06-02T19:24:58+00:00"
         },
         {
             "name": "symfony/debug",
-            "version": "v3.2.4",
+            "version": "v3.3.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/debug.git",
-                "reference": "9b98854cb45bc59d100b7d4cc4cf9e05f21026b9"
+                "reference": "e9c50482841ef696e8fa1470d950a79c8921f45d"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/debug/zipball/9b98854cb45bc59d100b7d4cc4cf9e05f21026b9",
-                "reference": "9b98854cb45bc59d100b7d4cc4cf9e05f21026b9",
+                "url": "https://api.github.com/repos/symfony/debug/zipball/e9c50482841ef696e8fa1470d950a79c8921f45d",
+                "reference": "e9c50482841ef696e8fa1470d950a79c8921f45d",
                 "shasum": ""
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             "require": {
@@ -532,13 +538,12 @@
                 "symfony/http-kernel": ">=2.3,<2.3.24|~2.4.0|>=2.5,<2.5.9|>=2.6,<2.6.2"
             },
             "require-dev": {
-                "symfony/class-loader": "~2.8|~3.0",
                 "symfony/http-kernel": "~2.8|~3.0"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "3.2-dev"
+                    "dev-master": "3.3-dev"
                 }
             },
             "autoload": {
@@ -565,20 +570,20 @@
             ],
             "description": "Symfony Debug Component",
             "homepage": "https://symfony.com",
-            "time": "2017-02-16T16:34:18+00:00"
+            "time": "2017-06-01T21:01:25+00:00"
         },
         {
             "name": "symfony/finder",
-            "version": "v3.2.4",
+            "version": "v3.3.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/finder.git",
-                "reference": "8c71141cae8e2957946b403cc71a67213c0380d6"
+                "reference": "baea7f66d30854ad32988c11a09d7ffd485810c4"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/finder/zipball/8c71141cae8e2957946b403cc71a67213c0380d6",
-                "reference": "8c71141cae8e2957946b403cc71a67213c0380d6",
+                "url": "https://api.github.com/repos/symfony/finder/zipball/baea7f66d30854ad32988c11a09d7ffd485810c4",
+                "reference": "baea7f66d30854ad32988c11a09d7ffd485810c4",
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             "require": {
@@ -587,7 +592,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "3.2-dev"
+                    "dev-master": "3.3-dev"
                 }
             },
             "autoload": {
@@ -614,7 +619,7 @@
             ],
             "description": "Symfony Finder Component",
             "homepage": "https://symfony.com",
-            "time": "2017-01-02T20:32:22+00:00"
+            "time": "2017-06-01T21:01:25+00:00"
         },
         {
             "name": "symfony/polyfill-mbstring",
@@ -677,16 +682,16 @@
         },
         {
             "name": "symfony/process",
-            "version": "v3.2.4",
+            "version": "v3.3.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/process.git",
-                "reference": "0ab87c1e7570b3534a6e51eb4ca8e9f6d7327856"
+                "reference": "8e30690c67aafb6c7992d6d8eb0d707807dd3eaf"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/process/zipball/0ab87c1e7570b3534a6e51eb4ca8e9f6d7327856",
-                "reference": "0ab87c1e7570b3534a6e51eb4ca8e9f6d7327856",
+                "url": "https://api.github.com/repos/symfony/process/zipball/8e30690c67aafb6c7992d6d8eb0d707807dd3eaf",
+                "reference": "8e30690c67aafb6c7992d6d8eb0d707807dd3eaf",
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@@ -695,7 +700,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "3.2-dev"
+                    "dev-master": "3.3-dev"
                 }
             },
             "autoload": {
@@ -722,20 +727,20 @@
             ],
             "description": "Symfony Process Component",
             "homepage": "https://symfony.com",
-            "time": "2017-02-16T14:07:22+00:00"
+            "time": "2017-05-22T12:32:03+00:00"
         },
         {
             "name": "symfony/yaml",
-            "version": "v3.2.4",
+            "version": "v3.3.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/yaml.git",
-                "reference": "9724c684646fcb5387d579b4bfaa63ee0b0c64c8"
+                "reference": "9752a30000a8ca9f4b34b5227d15d0101b96b063"
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             "dist": {
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-                "url": "https://api.github.com/repos/symfony/yaml/zipball/9724c684646fcb5387d579b4bfaa63ee0b0c64c8",
-                "reference": "9724c684646fcb5387d579b4bfaa63ee0b0c64c8",
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+                "reference": "9752a30000a8ca9f4b34b5227d15d0101b96b063",
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@@ -750,7 +755,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "3.2-dev"
+                    "dev-master": "3.3-dev"
                 }
             },
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@@ -777,7 +782,7 @@
             ],
             "description": "Symfony Yaml Component",
             "homepage": "https://symfony.com",
-            "time": "2017-02-16T22:46:52+00:00"
+            "time": "2017-06-02T22:05:06+00:00"
         },
         {
             "name": "webuni/commonmark-table-extension",
@@ -1156,27 +1161,27 @@
         },
         {
             "name": "phpspec/prophecy",
-            "version": "v1.6.2",
+            "version": "v1.7.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpspec/prophecy.git",
-                "reference": "6c52c2722f8460122f96f86346600e1077ce22cb"
+                "reference": "93d39f1f7f9326d746203c7c056f300f7f126073"
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             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpspec/prophecy/zipball/6c52c2722f8460122f96f86346600e1077ce22cb",
-                "reference": "6c52c2722f8460122f96f86346600e1077ce22cb",
+                "url": "https://api.github.com/repos/phpspec/prophecy/zipball/93d39f1f7f9326d746203c7c056f300f7f126073",
+                "reference": "93d39f1f7f9326d746203c7c056f300f7f126073",
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             },
             "require": {
                 "doctrine/instantiator": "^1.0.2",
                 "php": "^5.3|^7.0",
                 "phpdocumentor/reflection-docblock": "^2.0|^3.0.2",
-                "sebastian/comparator": "^1.1",
-                "sebastian/recursion-context": "^1.0|^2.0"
+                "sebastian/comparator": "^1.1|^2.0",
+                "sebastian/recursion-context": "^1.0|^2.0|^3.0"
             },
             "require-dev": {
-                "phpspec/phpspec": "^2.0",
+                "phpspec/phpspec": "^2.5|^3.2",
                 "phpunit/phpunit": "^4.8 || ^5.6.5"
             },
             "type": "library",
@@ -1215,43 +1220,44 @@
                 "spy",
                 "stub"
             ],
-            "time": "2016-11-21T14:58:47+00:00"
+            "time": "2017-03-02T20:05:34+00:00"
         },
         {
             "name": "phpunit/php-code-coverage",
-            "version": "2.2.4",
+            "version": "4.0.8",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/php-code-coverage.git",
-                "reference": "eabf68b476ac7d0f73793aada060f1c1a9bf8979"
+                "reference": "ef7b2f56815df854e66ceaee8ebe9393ae36a40d"
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-                "reference": "eabf68b476ac7d0f73793aada060f1c1a9bf8979",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-code-coverage/zipball/ef7b2f56815df854e66ceaee8ebe9393ae36a40d",
+                "reference": "ef7b2f56815df854e66ceaee8ebe9393ae36a40d",
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-                "php": ">=5.3.3",
-                "phpunit/php-file-iterator": "~1.3",
-                "phpunit/php-text-template": "~1.2",
-                "phpunit/php-token-stream": "~1.3",
-                "sebastian/environment": "^1.3.2",
-                "sebastian/version": "~1.0"
+                "ext-dom": "*",
+                "ext-xmlwriter": "*",
+                "php": "^5.6 || ^7.0",
+                "phpunit/php-file-iterator": "^1.3",
+                "phpunit/php-text-template": "^1.2",
+                "phpunit/php-token-stream": "^1.4.2 || ^2.0",
+                "sebastian/code-unit-reverse-lookup": "^1.0",
+                "sebastian/environment": "^1.3.2 || ^2.0",
+                "sebastian/version": "^1.0 || ^2.0"
             },
             "require-dev": {
-                "ext-xdebug": ">=2.1.4",
-                "phpunit/phpunit": "~4"
+                "ext-xdebug": "^2.1.4",
+                "phpunit/phpunit": "^5.7"
             },
             "suggest": {
-                "ext-dom": "*",
-                "ext-xdebug": ">=2.2.1",
-                "ext-xmlwriter": "*"
+                "ext-xdebug": "^2.5.1"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "2.2.x-dev"
+                    "dev-master": "4.0.x-dev"
                 }
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             "autoload": {
@@ -1277,7 +1283,7 @@
                 "testing",
                 "xunit"
             ],
-            "time": "2015-10-06T15:47:00+00:00"
+            "time": "2017-04-02T07:44:40+00:00"
         },
         {
             "name": "phpunit/php-file-iterator",
@@ -1467,40 +1473,50 @@
         },
         {
             "name": "phpunit/phpunit",
-            "version": "4.8.35",
+            "version": "5.7.20",
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                 "url": "https://github.com/sebastianbergmann/phpunit.git",
-                "reference": "791b1a67c25af50e230f841ee7a9c6eba507dc87"
+                "reference": "3cb94a5f8c07a03c8b7527ed7468a2926203f58b"
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-                "reference": "791b1a67c25af50e230f841ee7a9c6eba507dc87",
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+                "reference": "3cb94a5f8c07a03c8b7527ed7468a2926203f58b",
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                 "ext-json": "*",
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-                "ext-reflection": "*",
-                "ext-spl": "*",
-                "php": ">=5.3.3",
-                "phpspec/prophecy": "^1.3.1",
-                "phpunit/php-code-coverage": "~2.1",
+                "ext-libxml": "*",
+                "ext-mbstring": "*",
+                "ext-xml": "*",
+                "myclabs/deep-copy": "~1.3",
+                "php": "^5.6 || ^7.0",
+                "phpspec/prophecy": "^1.6.2",
+                "phpunit/php-code-coverage": "^4.0.4",
                 "phpunit/php-file-iterator": "~1.4",
                 "phpunit/php-text-template": "~1.2",
                 "phpunit/php-timer": "^1.0.6",
-                "phpunit/phpunit-mock-objects": "~2.3",
-                "sebastian/comparator": "~1.2.2",
-                "sebastian/diff": "~1.2",
-                "sebastian/environment": "~1.3",
-                "sebastian/exporter": "~1.2",
-                "sebastian/global-state": "~1.0",
-                "sebastian/version": "~1.0",
+                "phpunit/phpunit-mock-objects": "^3.2",
+                "sebastian/comparator": "^1.2.4",
+                "sebastian/diff": "^1.4.3",
+                "sebastian/environment": "^1.3.4 || ^2.0",
+                "sebastian/exporter": "~2.0",
+                "sebastian/global-state": "^1.1",
+                "sebastian/object-enumerator": "~2.0",
+                "sebastian/resource-operations": "~1.0",
+                "sebastian/version": "~1.0.3|~2.0",
                 "symfony/yaml": "~2.1|~3.0"
             },
+            "conflict": {
+                "phpdocumentor/reflection-docblock": "3.0.2"
+            },
+            "require-dev": {
+                "ext-pdo": "*"
+            },
             "suggest": {
+                "ext-xdebug": "*",
                 "phpunit/php-invoker": "~1.1"
             },
             "bin": [
@@ -1509,7 +1525,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "4.8.x-dev"
+                    "dev-master": "5.7.x-dev"
                 }
             },
             "autoload": {
@@ -1535,30 +1551,33 @@
                 "testing",
                 "xunit"
             ],
-            "time": "2017-02-06T05:18:07+00:00"
+            "time": "2017-05-22T07:42:55+00:00"
         },
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