Fix confluence links bug

tests/ContentTypes/Markdown/LinkRendererTest.php

@@ -37,7 +37,7 @@ class LinkRendererTest extends \PHPUnit_Framework_TestCase
     {
         return [
             // /Widgets/Page
-            ['<a href="http://google.ch">Link</a>', '[Link](http://google.ch)', 'Widgets/Page.html'],
+            ['<a href="http://google.ch" class="external">Link</a>', '[Link](http://google.ch)', 'Widgets/Page.html'],
             ['<a href="#features">Link</a>', '[Link](#features)', 'Widgets/Page.html'],
             ['<a href="Button.html">Link</a>', '[Link](Button.md)', 'Widgets/Page.html'],
             ['<a href="Button.html">Link</a>', '[Link](./Button.md)', 'Widgets/Page.html'],