fix(package): update chokidar to version 2.0.4

Closes #97

Author: greenkeeper[bot]

package.json

@@ -23,7 +23,7 @@
     "babel-polyfill": "^6.13.0",
     "babel-preset-fe": "1.0.16",
     "chalk": "^1.1.3",
-    "chokidar": "^1.6.0",
+    "chokidar": "^2.0.4",
     "clone-stats": "^1.0.0",
     "colors": "^1.1.2",
     "commander": "^2.9.0",