Fix dependencies lowest

Author: nanasess

composer.json

@@ -28,7 +28,7 @@
         "phpunit/phpunit-mock-objects": "~2.3",
         "phpspec/prophecy": "^1.3.1",
         "symfony/yaml": "~2.1|~3.0",
-        "sebastian/comparator": "~1.2.2",
+        "sebastian/comparator": "~1.2.4",
         "sebastian/diff": "~1.2",
         "sebastian/environment": "~1.3",
         "sebastian/exporter": "~1.2",