更新winston包

@@ -41,7 +41,7 @@
     "underscore": "^1.8.3",
     "underscore.string": "^3.0.3",
     "update-notifier": "^0.5.0",
-    "winston": "git://github.com/niftylettuce/winston",
+    "winston": "^3.3.3",
     "winston-hipchat": "^0.1.3",
     "winston-mongodb": "~1.1.1"
   },