See Issue #855
The class [IssueEvent](https://github.com/PyGithub/PyGithub/blob/master/github/IssueEvent.py) is missing a large number of attributes documented in the [API](https://developer.github.com/v3/issues/events/).
This is also commented about in #653 to a degree
27 of the tests 27 known event types have tests.
**Currently Tested using Issue #30**
- [x] subscribed
- [x] assigned
- [x] referenced
- [x] closed
- [x] labeled
**Currently Tested using Issue/PR #538**
- [x] merged
- [x] mentioned
- [x] review_requested
**Currently Tested using Issue/PR #857**
- [x] reopened
- [x] unassigned
- [x] unlabeled
- [x] renamed
- [x] base_ref_changed
- [x] head_ref_deleted
- [x] head_ref_restored
- [x] milestoned
- [x] demilestoned
- [x] locked
- [x] unlocked
- [x] review_dismissed
- [x] review_request_removed
- [x] marked_as_duplicate
- [x] unmarked_as_duplicate
- [x] added_to_project
- [x] moved_columns_in_project
- [x] removed_from_project
- [x] converted_note_to_issue - Note: this event is tied into Issue #866
This PR is now ready to be merged
Aaron L. Levine