chore: release v0.12.1 (#797)

* Update CHANGELOG.md

* fix(epoch): fix nil epoch storeKey in perp keeper (#796)

* Update CHANGELOG.md

* fix panic

* update changelog

Co-authored-by: NibiruHeisenberg <101130700+NibiruHeisenberg@users.noreply.github.com>

* Update CHANGELOG.md

Co-authored-by: AgentSmithMatrix <98403347+AgentSmithMatrix@users.noreply.github.com>
Co-authored-by: Agent Smith <agentsmith@matrixsystems.co>

CHANGELOG.md

@@ -50,7 +50,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 * [#798](https://github.com/NibiruChain/nibiru/pull/798) - fix integration tests caused by PR #786
 
-### Bug Fixes
+## [v0.12.1](https://github.com/NibiruChain/nibiru/releases/tag/v0.12.1) - 2022-08-04
 
 * [#796](https://github.com/NibiruChain/nibiru/pull/796) - fix bug that caused that epochKeeper was nil when running epoch hook from Perp module