docs: add changelog (#15)

CHANGELOG.md

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+# Changelog
+
+## [Unreleased]
+
+## [v1.4.2](https://github.com/cosmos/gogoproto/releases/tag/v1.4.2) - 2022-09-14
+
+### Features
+
+- [#13](https://github.com/cosmos/gogoproto/pull/13) Add `AllFileDescriptors` function.
+
+### Improvements
+
+- [#8](https://github.com/cosmos/gogoproto/pull/8) Fix typo in `doc.go`.
+- [#8](https://github.com/cosmos/gogoproto/pull/8) Support for merging messages implementing Merger which are embedded by value.
+- [#8](https://github.com/cosmos/gogoproto/pull/8) Use reflect.Value.String() for String kinds in proto equal.
+
+## [v1.4.1](https://github.com/cosmos/gogoproto/releases/tag/v1.4.1) - 2022-08-30
+
+### Improvements
+
+- [#6](https://github.com/cosmos/gogoproto/pull/6) Add buf.yaml for cosmos/gogo-proto module.
+
+### Bug Fixes
+
+- [226206f](https://github.com/cosmos/gogoproto/commit/226206f39bd7276e88ec684ea0028c18ec2c91ae) Fixed order of imports, make stable generation result.
+
+## [v1.4.0](https://github.com/cosmos/gogoproto/releases/tag/v1.4.0) - 2022-03-18
+
+- Migration from [regen-network/protobuf](https://github.com/regen-network/protobuf), a fork of [gogo/protobuf](https://github.com/gogo/protobuf) used by the Cosmos SDK to [cosmos/gogoproto](https://github.com/cosmos/gogoproto) (this repository).