Merge pull request #97 from srilq/chore/chokidar-v2.x

Use chokidar@2

Author: STRML

package.json

@@ -27,7 +27,7 @@
   },
   "homepage": "https://github.com/kmagiera/babel-watch#readme",
   "dependencies": {
-    "chokidar": "^1.4.3",
+    "chokidar": "^2.0.4",
     "commander": "^2.9.0",
     "lodash.debounce": "^4.0.8",
     "lodash.isregexp": "^4.0.1",