remove Monolog dependency, it's part of Logger Factory

composer.json

@@ -19,7 +19,6 @@
   ],
   "require": {
     "guzzlehttp/guzzle": "^7.0",
-    "monolog/monolog": "^1.20",
     "d3/sensitive-message-formatter": "^1.0",
     "d3/logger-factory": "^1.0"
   },