remove useless deps

Author: zoubin

package.json

@@ -29,8 +29,7 @@
     "duplexer2": "^0.1.4",
     "figures": "^1.4.0",
     "pretty-ms": "^2.1.0",
-    "tap-out": "^1.4.1",
-    "through2": "^2.0.0"
+    "tap-out": "^1.4.1"
   },
   "devDependencies": {
     "eslint": "^2.0.0",