update changelog for v5.0.0 release

CHANGELOG.md

@@ -34,7 +34,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 # Changelog
 
-## [Unreleased]
+## [v5.0.0](https://github.com/cosmos/ibc-go/releases/tag/v5.0.0) - 2022-09-28
 
 ### Dependencies
 
@@ -51,8 +51,6 @@ Ref: https://keepachangelog.com/en/1.0.0/
 * (apps/27-interchain-accounts) [\#2058](https://github.com/cosmos/ibc-go/pull/2058) Added `MessageRouter` interface and replaced `*baseapp.MsgServiceRouter` with it. The controller and host keepers of apps/27-interchain-accounts have been updated to use it.
 * (apps/27-interchain-accounts)[\#2302](https://github.com/cosmos/ibc-go/pull/2302) Handle unwrapping of channel version in interchain accounts channel reopening handshake flow. The `host` submodule `Keeper` now requires an `ICS4Wrapper` similarly to the `controller` submodule.
 
-### State Machine Breaking
-
 ### Improvements
 
 * (27-interchain-accounts) [\#1352](https://github.com/cosmos/ibc-go/issues/1352) Add support for Cosmos-SDK simulation to ics27 module.