[chore] Bump dependencies (#227)

- bump debug to version 2.6.8
- bump redis to version 2.7.1
- bump ioredis to version 3.1.1
- bump mocha to version 3.4.2

Author: darrachequesne

package.json

@@ -14,16 +14,16 @@
     "test": "mocha"
   },
   "dependencies": {
-    "debug": "2.3.3",
+    "debug": "~2.6.8",
     "notepack.io": "~2.0.0",
-    "redis": "2.6.3",
+    "redis": "~2.7.1",
     "socket.io-adapter": "~1.1.0",
     "uid2": "0.0.3"
   },
   "devDependencies": {
     "expect.js": "0.3.1",
-    "ioredis": "2.5.0",
-    "mocha": "3.2.0",
+    "ioredis": "^3.1.1",
+    "mocha": "^3.4.2",
     "socket.io": "latest",
     "socket.io-client": "latest"
   }