upgrade ratchet/pawl to v0.4.x

Author: Dave Xie

composer.json

@@ -25,7 +25,7 @@
     "php": ">=5.5.0",
     "ext-json": "*",
     "guzzlehttp/guzzle": "^6.0|^7.0",
-    "ratchet/pawl": "^0.3.2",
+    "ratchet/pawl": "^0.4.1",
     "monolog/monolog": "~1.0|~2.0"
   },
   "require-dev": {