Add changelog

Author: stevegeek

CHANGELOG.md

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+## [0.4.2] - Unreleased
+
+### Changed
+
+- Params that have default values are no longer required to prepare the operation.
+
+## [0.4.1] - 2023/06/22
+
+### Changed
+
+- Updated tests.
+- Tweaked operation templates.
+
+## [0.4.0] - 2023/06/22
+
+### Removed
+
+- Removed dry-monads as a dependency of TypedOperation. It can now be included in ApplicationOperation instead.
+
+### Added
+
+- Generator now creates a test file.
+
+### Changed
+
+- Avoided leaking the implementation detail of using dry-struct under the hood.
+
+## [0.3.0] - 2023/06/19
+
+### Removed
+
+- Ruby 2.7 is not supported currently.
+- Rails 6 is not supported currently due to vident dependency. Considering Literal::Attributes instead.
+
+### Changed
+
+- Updated test config.
+- Added Github workflow for testing.
+
+### Added
+
+- Added some tests and updated docs.
+- Added typed operation install and 'typed_operation' generators.
+
+### Fixed
+
+- Fixed 'require's.
+
+## [0.1.0] - Unreleased
+
+### Added
+
+- Initial implementation of the project.