Brought into spec with GitLab API docs (#352).

Author: gmessner

src/test/resources/org/gitlab4j/api/hook.json

@@ -3,12 +3,13 @@
   "url": "http://example.com/hook",
   "project_id": 3,
   "push_events": true,
+  "push_events_branch_filter": "",
   "issues_events": true,
+  "confidential_issues_events": true,
   "merge_requests_events": true,
   "tag_push_events": true,
   "note_events": true,
   "job_events": true,
-  "build_events": true,
   "pipeline_events": true,
   "wiki_page_events": true,
   "enable_ssl_verification": true,