chore(package): update chokidar to version 3.3.1

Closes #26

Author: greenkeeper[bot]

package.json

@@ -17,7 +17,7 @@
     "redux-saga": "^0.16.0"
   },
   "devDependencies": {
-    "chokidar": "^2.0.3",
+    "chokidar": "^3.3.1",
     "connect-history-api-fallback": "^1.5.0",
     "firebase-tools": "^3.17.7",
     "rollup": "^0.57.1",