Deprecate Travis and use Github Actions

[scottwernervt]

• [x] Move and delete tox.ini into pyproject.toml
• [x] Update pre-commit package dependencies
• [x] New pre-commit hooks
  • [x] check-ast
  • [x] check-toml
  • [x] end-of-file-fixer
  • [x] trailing-whitespace
• [x] This command has been deprecated. Use twine check instead: https://packaging.python.org/guides/making-a-pypi-friendly-readme#validating-restructuredtext-markup
• [x] Move pytest config to pyproject.toml
• [ ] Setup tox-gh-actions
• [ ] Remove .travis.yml and Travis CI auth or tokens