Add Changelog

CHANGELOG.md

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+# Changelog
+
+## [5.1.0-dev] - unreleased
+
+- Feature: [[#41](https://github.com/ethereum/evmc/pull/41)]
+  Go language bindings for EVMC.
+- Feature: [[#56](https://github.com/ethereum/evmc/pull/56), [#62](https://github.com/ethereum/evmc/pull/62)]
+  New error codes.
+- Feature: [[#67](https://github.com/ethereum/evmc/pull/67), [#68](https://github.com/ethereum/evmc/pull/68), [#70](https://github.com/ethereum/evmc/pull/70)]
+  More helper functions.
+- Fix: [[#72](https://github.com/ethereum/evmc/pull/72)]
+  Go bindings: Properly handle unknown error codes.
+- Improved: [[#58](https://github.com/ethereum/evmc/pull/58)]
+  Documentation has been extended.
+- Improved: [[#59](https://github.com/ethereum/evmc/pull/59)]
+  Optional Result Storage helper module has been separated.
+
+## [5.0.0] - 2018-08-10
+
+- Feature: [[#23](https://github.com/ethereum/evmc/pull/23), [#24](https://github.com/ethereum/evmc/pull/24)]
+  List of status codes extended and reordered.
+- Feature: [[#32](https://github.com/ethereum/evmc/pull/32)]
+  VM Tracing API.
+- Feature: [[#33](https://github.com/ethereum/evmc/pull/33), [#34](https://github.com/ethereum/evmc/pull/34)]
+  The support library with metrics tables for EVM1 instructions.
+- Feature: [[#35](https://github.com/ethereum/evmc/pull/35)]
+  Ability to create EVMC CMake package.
+- Feature: [[#40](https://github.com/ethereum/evmc/pull/40)]
+  The loader support library for VM dynamic loading.
+- Feature: [[#45](https://github.com/ethereum/evmc/pull/45)]
+  Constantinople: Support for `CREATE2` instruction.
+- Feature: [[#49](https://github.com/ethereum/evmc/pull/49)]
+  Constantinople: Support for `EXTCODEHASH` instruction.
+- Feature: [[#52](https://github.com/ethereum/evmc/pull/52)]
+  Constantinople: Storage status is reported back from `evmc_set_storage()`.
+
+
+[5.1.0-dev]: https://github.com/ethereum/evmc/compare/v5.0.0...HEAD
+[5.0.0]: https://github.com/ethereum/evmc/releases/tag/v5.0.0