package: bump engine.io

Author: rauchg

package.json

@@ -21,7 +21,7 @@
     "test": "mocha --reporter dot --slow 200ms --bail"
   },
   "dependencies": {
-    "engine.io": "1.6.9",
+    "engine.io": "1.6.10",
     "socket.io-parser": "2.2.6",
     "socket.io-client": "1.4.6",
     "socket.io-adapter": "0.4.0",