allow to use with sf3 and php7

Author: norkunas

composer.json

@@ -10,9 +10,9 @@
         }
     ],
     "require": {
-        "php": ">=5.4.0",
+        "php": ">=5.4.0|^7.0",
         "guzzlehttp/guzzle": "~5.3",
-        "symfony/options-resolver": "~2.7"
+        "symfony/options-resolver": "~2.7|^3.0"
     },
     "require-dev": {
         "phpunit/phpunit": "~4.6"