Remove php dependency

Author: nuzil

composer.json

@@ -11,7 +11,6 @@
         }
     ],
     "require": {
-        "php": "~5.5.0|~5.6.0|~7.0.0",
         "magento/framework": ">=100.1.0",
         "magento/module-store": ">=100.1.0",
         "magento/module-backend": ">=100.1.0",