add devdep: cleanup-coverage-code

Author: tunnckoCore

package.json

@@ -40,8 +40,9 @@
   },
   "dependencies": {},
   "devDependencies": {
+    "cleanup-coverage-code": "~1.0.1",
     "istanbul-harmony": "^0.3.1",
     "mocha": "*",
     "mocha-lcov-reporter": "^0.0.1"
   }
-}
+}