Fail2slack

- Add pylint 3.10 support (fstring, replace socket with platform)
- Update dependencies
- Add v3.10, remove v3.6
- Update README, code of conduct

- Python 3.9 support
- Code style updates (pylint)
- Update dependencies
- Migrate from Travis-CI to GitHub Actions

Add housekeeping, updates for new branch

Refactor get_jails_status for better code coverage, add identifier support to update message.

Initial package release.