=====
- FIX ISSUE WITH -U <USERNAME> NOT WORKING.
- Update tests to use newer Python and to use Ansible 2.8.x or 2.9.x.
- Improving documentation.
- Update module docstring.
- Update napalm_get_facts to allow _get_checkpoint_file for NX-OS
- Update dev tooling to pin dependencies and to install black
- Blacken the code base; exclude from PY27 install