BUG: datetime64 - Timestamp incorrectly raising TypeError
- [ ] closes #xxxx
- [x] tests added / passed
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [x] whatsnew entry

Travis has been done for a few hours, no idea why it’s stuck on yellow lgtm. can you rebase and push again. rebased+green Thanks @jbrockmendel 