Fix lint error and link out to RTL plugin manifest issue

Author: kadamwhite

src/plugins.js

@@ -130,8 +130,9 @@ module.exports = {
 		fileName: 'asset-manifest.json',
 		writeToFileEmit: true,
 		map: ( file ) => {
-			// Make sure an RTL file has a separate entry in the manifest.
-			if ( /\.rtl\.css$/.test( file.path ) ) {
+			// Work around https://github.com/romainberger/webpack-rtl-plugin/issues/14
+			// to make sure an RTL file has a separate entry in the manifest.
+			if ( ( /\.rtl\.css$/ ).test( file.path ) ) {
 				file.name = file.name.replace( '.css', '.rtl.css' );
 			}