Move chokidar to devDeps

package.json

@@ -48,7 +48,6 @@
     "blueimp-canvas-to-blob": "^3.5.0",
     "browser-encrypt-attachment": "^0.3.0",
     "browser-request": "^0.3.3",
-    "chokidar": "^1.6.1",
     "classnames": "^2.1.2",
     "commonmark": "^0.27.0",
     "draft-js": "^0.8.1",
@@ -92,6 +91,7 @@
     "babel-preset-es2016": "^6.11.3",
     "babel-preset-es2017": "^6.14.0",
     "babel-preset-react": "^6.11.1",
+    "chokidar": "^1.6.1",
     "eslint": "^3.13.1",
     "eslint-config-google": "^0.7.1",
     "eslint-plugin-babel": "^4.0.1",