Bump ratchet/rfc6455 to ^0.4 for api consistency

Author: andrewmy

composer.json

@@ -13,6 +13,7 @@
         "thruway/pawl-transport": "^0.5.2",
         "voryx/thruway-common": "^1.0.1",
         "ratchet/pawl": "^0.4.3",
+        "ratchet/rfc6455": "^0.4.0",
         "react/dns": "^1.4",
         "react/event-loop": "^1.2",
         "react/promise": "^2.8"