chore(package): update @types/chokidar to version 2.1.3

Closes #183

Author: greenkeeper[bot]

package.json

@@ -81,7 +81,7 @@
   "devDependencies": {
     "@commitlint/cli": "7.2.1",
     "@commitlint/config-conventional": "7.1.2",
-    "@types/chokidar": "1.7.5",
+    "@types/chokidar": "2.1.3",
     "@types/jest": "23.3.10",
     "@types/json5": "0.0.30",
     "@types/node": "8.10.*",