Include require PHP 7 with Composer

Author: wandersonwhcr

composer.json

@@ -13,6 +13,9 @@
             "RomansTest\\": "test"
         }
     },
+    "require": {
+        "php": "^7.0"
+    },
     "require-dev": {
         "phpunit/phpunit": "6.1.*"
     }