no-regexp-lookbehind.js - fix negative lookbehind pattern (#42)

Author: ghbob

lib/rules/no-regexp-lookbehind.js

@@ -1,6 +1,6 @@
 'use strict';
 
-const hasLookbehind = s => s.includes('(?<=') || s.includes('(?<!)')
+const hasLookbehind = s => s.includes('(?<=') || s.includes('(?<!')
 
 module.exports = (context, badBrowser) => ({
   'Literal[regex]'(node) {