Merge pull request #4 from temp/fix-errors

fix version contraints

Author: pl-github

composer.json

@@ -14,6 +14,7 @@
         "php": ">=5.4.0"
     },
     "require-dev": {
+        "php": ">=5.5.0",
         "mikey179/vfsStream": "~1.2",
         "phpunit/phpunit": "~4.5",
         "symfony/http-foundation": "~2.3"