docs: create changelog

CHANGELOG.md

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+# Changelog
+This is the changelog for NeoFS Proto
+
+## [0.2.0] - 2019-11-21
+
+### Added
+- Container not found error 
+- GitHub Actions as CI and Codecov 
+- Auto-generated proto documentation
+- RequestMetaHeader to all RPC requests
+- RequestVerificationHeader to all RPC requests
+
+### Changed
+- Moved TTL and Epoch fields to RequestMetaHeader
+- Renamed Version in object.SearchRequest to QueryVersion
+- Removed SetTTL, GetTTL, SetEpoch, GetEpoch from all RPC requests  
+
+## 0.1.0 - 2019-11-18
+
+Initial public release
+
+[0.2.0]: https://github.com/nspcc-dev/neofs-proto/compare/v0.1.0...v0.2.0