chore(package): update cpy-cli to version 3.1.1

Closes #212

Author: greenkeeper[bot]

package.json

@@ -129,7 +129,7 @@
     "babel-plugin-transform-unicode-property-regex": "^2.0.5",
     "babel-register": "^6.26.0",
     "copy-webpack-plugin": "^4.0.1",
-    "cpy-cli": "^1.0.1",
+    "cpy-cli": "^3.1.1",
     "esdoc": "^0.5.2",
     "eslint": "^3.16.1",
     "mkdirp": "^0.5.1",