lets stop allowing all future php versions

Author: lsmith77

composer.json

@@ -21,7 +21,7 @@
     ],
 
     "require": {
-        "php":                            ">=5.3.9",
+        "php":                            "^5.3.9|~7.0",
         "psr/log":                        "~1.0",
         "symfony/framework-bundle":       "~2.3|~3.0",
         "symfony/http-kernel":            "^2.3.24|~3.0",