Start with a basic changelog

CHANGELOG.md

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+# Unreleased: 0.4.2
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+- Switch to GitHub Actions for CI (instead of Travis CI)
+- Various documentation and readme tweaks
+- Add type annotations ([#12](https://github.com/soxofaan/dahuffman/issues/12), [#13](https://github.com/soxofaan/dahuffman/pull/13), by [@KOLANICH](https://github.com/KOLANICH))
+- Introduce code formatting tools; black, isort, pre-commit
+- Eliminate `pkg_resources` dependency and switch to `importlib.resources` for Python 3.12+ compatibility ([#19](https://github.com/soxofaan/dahuffman/issues/19))
+- Switch to `pyproject.toml` based project metadata ([#21](https://github.com/soxofaan/dahuffman/issues/21))
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+# 0.4.1 (2020-06-10)
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+- Fix packaging of `dahuffman.codecs` ([#10](https://github.com/soxofaan/dahuffman/issues/10))
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