Designate root level eslint config

Author: roykho

Diff for: .eslintrc.js

@@ -1,3 +1,4 @@
 module.exports = {
+	root: true,
 	extends: [ 'plugin:@woocommerce/eslint-plugin/recommended' ],
 };

Diff for: plugins/woocommerce/.eslintrc.js

@@ -1,7 +1,6 @@
 /** @format */
 
 module.exports = {
-	root: true,
 	env: {
 		browser: true,
 		es6: true,