added missing dependency

Author: sokra

package.json

@@ -41,6 +41,7 @@
     "babel-eslint": "^3.1.9",
     "babelify": "^6.1.2",
     "chokidar-cli": "^0.2.1",
+    "codecov.io": "^0.1.2",
     "coveralls": "^2.11.2",
     "eslint": "^0.21.2",
     "istanbul": "^0.3.14",