Decode

New Contributors
* Hoshock made their first contribution in https://github.com/deshima-dev/decode/pull/20

**Full Changelog**: https://github.com/deshima-dev/decode/compare/v0.5.9...v0.6.0

This release closes 15.

- Fix wrong version of pyyaml (`^3.13` → `^5.3`) in `pyproject.toml`
- Also update `poetry.lock`
- Update version numbers (0.5.8 → 0.5.9) written in:
- `pyproject.toml`
- `decode/__init__.py`
- `docs/conf.py`
- `tests/test_metadata.py`

This release closes 13.

- Update Python requirements (>=3.6.1 → >= 3.6)
- Also update poetry.lock
- Update version numbers (0.5.7 → 0.5.8) written in:
- pyproject.toml
- decode/__init__.py
- docs/conf.py
- tests/test_metadata.py

- Update version numbers written in:
- pyproject.toml
- decode/__init__.py
- docs/conf.py
- tests/test_metadata.py

- Use Poetry for package management
- Use GitHub Actions for testing and publishing package
- Update version numbers written in Python scripts

- Remove joke functions
- Use Travis CI to do auto testing and docs building
- Docs are now hosted in the `gh-pages` branch