Add eslint command on lint-staged (facebookexperimental#402)

Summary:
I think, we need `eslint --fix` after `prettier --write` in `lint-staged`

Pull Request resolved: facebookexperimental#402

Reviewed By: drarmstr

Differential Revision: D22380637

Pulled By: mondaychen

fbshipit-source-id: ac01a6ae565298abcb47919ecfb943b95502a22a

package.json

@@ -88,6 +88,7 @@
     }
   },
   "lint-staged": {
-    "*.{js,md,json}": "prettier --write"
+    "*.{js,md,json}": "prettier --write",
+    "*.{js}": "eslint --fix"
   }
 }