Namespace custom ESLint rules through eslint-plugin-lint

Reviewed By: mzlee

Differential Revision: D6934651

fbshipit-source-id: 3cb0c3550ad628e3b5c0bdaec8cde9d5579ea0af

Author: zertosh

local-cli/.eslintrc

@@ -4,7 +4,7 @@
     // compatible with node 4
     "comma-dangle": 0,
 
-    "extra-arrow-initializer": 0,
+    "lint/extra-arrow-initializer": 0,
     "no-alert": 0,
     "no-console-disallow": 0
   },