Support both rx/websocket 2.x and 1.x

Author: WyriHaximus

composer.json

@@ -15,11 +15,11 @@
     "clue/block-react": "^1.1",
     "ocramius/package-versions": "^1.1",
     "react/dns": "^0.4.9",
-    "react/http-client": "^0.4.17",
+    "react/http-client": "^0.5 || ^0.4.17",
     "reactivex/rxphp": "^2.0.4",
     "rx/helpers": "^1.0",
     "rx/operator-extras": "^2.1",
-    "rx/websocket": "^1.0",
+    "rx/websocket": "^2.0 || ^1.0",
     "voryx/event-loop": "^2.0.2"
   },
   "require-dev": {