chore(doc-gen): fix atScript file reader test

Closes angular#1458

Author: marclaval

docs/dgeni-package/readers/atScript.spec.js

@@ -33,7 +33,7 @@ describe('atScript file reader', function() {
 
 
  it('should provide a default pattern', function() {
- expect(reader.defaultPattern).toEqual(/\.js$/);
+ expect(reader.defaultPattern).toEqual(/\.js|\.es6$/);
  });