Update Changelog and README with Rust changes

CHANGELOG.md

@@ -48,6 +48,17 @@ and this project adheres to [Semantic Versioning].
 - The `evmc-vmtester` tool received support for EVMC module configuration.
   E.g. `evmc-vmtester ./my_vm,mode=interpreter`.
   [[#366](https://github.com/ethereum/evmc/pull/366)]
+- In `evmc-vm` Rust crate, `ExecutionResult` now has `success`, `failure` and `revert` helpers.
+  [[#297](https://github.com/ethereum/evmc/pull/297),
+   [#368](https://github.com/ethereum/evmc/pull/368)]
+- Introduction of `evmc-declare` Rust crate with a procedural macro for easy VM declaration.
+  [[#262](https://github.com/ethereum/evmc/pull/262),
+   [#316](https://github.com/ethereum/evmc/pull/316)]
+- Introduction of `ExecutionMessage` wrapper in the `evmc-vm` Rust crate.
+  [[#324](https://github.com/ethereum/evmc/pull/324)]
+- Added type aliases and traits on basic types in the `evmc-vm` Rust crate.
+  [[#342](https://github.com/ethereum/evmc/pull/342),
+   [#343](https://github.com/ethereum/evmc/pull/343)]
 
 ### Changed
 
@@ -323,4 +334,4 @@ and this project adheres to [Semantic Versioning].
 
 [Cable]: https://github.com/ethereum/cable
 [Keep a Changelog]: https://keepachangelog.com/en/1.0.0/
-[Semantic Versioning]: https://semver.org
+[Semantic Versioning]: https://semver.org

README.md

@@ -26,7 +26,7 @@ Please visit the [documentation].
 | **Rust** _(bindings)_[²](#n2) | 2018 edition          | 1.31.0 and newer
 
 <b id="n1">1</b>. The C90 support is limited to the core `evmc.h` header only.\
-<b id="n2">2</b>. Rust support is limited and not complete yet.
+<b id="n2">2</b>. Rust support is limited and not complete yet, but it is mostly functional already. Breaking changes are possible at this stage.
 
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