Makey-cli

Added

- `CI` - GitHub Actions CI.
- `python-test` - Lint and Test package, and publish test coverage to Codecov.
- `python-publish` - Publish package to PYPI.
- `docs-publish` - Publish docs to GitHub Pages.
- `CI` - `pre-commit` lint hooks.

Changed

- `GENERAL` - Code formatting and folder structure.
- `BUILD` - Upgrade from `setup.py` to `pyproject.toml` with `flit` build tool.

Removed

- `CI` - Travis CI.

Added

- `makey`: `-e`/`--exclude` - Exclude given characters from passkeys.
- `INSTALL` - Install makey-cli with Homebrew! See [Install Guide](install.md "Install Guide").

Changed

- `makey` - Quote characters (`"` and `'`) are now ALWAYS excluded from passkeys.

Changed

- `DEPENDENCY` - Update Click from v7.x to v8.x.
- `GENERAL` - Code formatting and structure.

Fixed

- `makey`: `--version` - Correctly works again with latest dependencies.

Removed

- `GENERAL` - Support for python versions 3.6 and 3.7.

Added

- `makey` - Create a secure and randomized passkey, copied directly to your clipboard.
- `-l/--length` - Specify a custom passkey length.
- `-s/--show` - Send passkey to stdout in addition to the clipboard.
- `--version` - Check current installed version.
- `--help` - Print out cli usage.