add a changelog

CHANGELOG.md

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+# Changelog
+
+
+## [Unreleased] - 2024-02-xx
+
+### Changed
+
+- Update from `Mix.Config` to `Config` ([#4](https://github.com/elixir-waffle/waffle_gcs/pull/4)) (Rafael Scheffer, @rschef)
+- Bump `google_api_storage` from `0.29` to `0.34` ([#4](https://github.com/elixir-waffle/waffle_gcs/pull/4)) (Rafael Scheffer, @rschef)
+- Bump `waffle` from `1.1.5` to `1.1.8`
+- Bump `ex_doc` from `0.25` to `0.31`
+- Bump `dialyxir` from `1.1.0` to `1.4.3`
+
+### Added
+-
+
+### Removed
+
+- **Breaking:** drop support for Elixir versions `< v1.12`
+
+### Fixed
+-
+
+
+## [0.2.0] - 2021-08-20
+
+### Changed
+- Bump `waffle` from `0.0.3` to `1.1`
+- Bump `google_api_storage` from `0.12` to `0.14`
+### Added
+- Initial support for custom token generation
+- Allow custom GCS object headers w/ `gcs_object_headers/2` callback
+
+---
+#### References
+- https://common-changelog.org