Allow extension for import/no-unassigned-import allow list

Fixes #517

Author: sindresorhus

config/plugins.js

@@ -255,7 +255,9 @@ module.exports = {
 				allow: [
 					'@babel/polyfill',
 					'**/register',
+					'**/register.*',
 					'**/register/**',
+					'**/register/**.*',
 					'**/*.css',
 					'**/*.scss',
 					'**/*.sass',