Use eslint-local-rules plugin

This allows to avoid having errors in editors that
supports eslint

cf https://github.com/eslint/eslint/issues/8769

package.json

@@ -35,6 +35,7 @@
     "eslint": "^5.3.0",
     "eslint-config-babel": "^7.0.2",
     "eslint-plugin-flowtype": "^2.50.0",
+    "eslint-plugin-local-rules": "0.1.0",
     "eslint-plugin-prettier": "^2.6.2",
     "flow-bin": "^0.80.0",
     "graceful-fs": "^4.1.11",
@@ -77,7 +78,7 @@
   },
   "lint-staged": {
     "*.js": [
-      "eslint --format=codeframe --rulesdir='./scripts/eslint_rules'"
+      "eslint --format=codeframe"
     ]
   },
   "jest": {