Forward compatibility with upcoming Socket v0.6 and v0.7

Author: clue

composer.json

@@ -6,7 +6,7 @@
     "require": {
         "php": ">=5.3.0",
         "react/cache": "~0.4.0|~0.3.0",
-        "react/socket": "^0.5 || ^0.4.4",
+        "react/socket": "^0.7 || ^0.6 || ^0.5 || ^0.4.4",
         "react/stream": "^0.6 || ^0.5 || ^0.4.5",
         "react/promise": "~2.1|~1.2",
         "react/promise-timer": "~1.1"