fix duplicate changelog entries

CHANGELOG.md

@@ -37,17 +37,6 @@ Ref: https://keepachangelog.com/en/1.0.0/
 # Changelog
 
 ## [v0.21.0-rc2] - 2022-01-23
-## Unreleased
-
-### Bug Fixes
-
-* (rpc) [#1613](https://github.com/evmos/ethermint/pull/1613) Change the default json-rpc listen address to localhost.
-* (upgrade) [#1617](https://github.com/evmos/ethermint/pull/1617) Refactor `evm` module's parameters to store them under a single store key
-* (rpc) [#1611](https://github.com/evmos/ethermint/pull/1611) Add missing next fee in fee history, fix wrong oldestBlock and align earliest input as ethereum.
-
-### Improvements
-
-* (cli) [#1615](https://github.com/evmos/ethermint/pull/1615) Support customize db opener in `StartCmd`.
 
 ### State Machine Breaking
 
@@ -63,6 +52,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 * (deps) [#1532](https://github.com/evmos/ethermint/pull/1532) Upgrade Go-Ethereum version to [`v1.10.26`](https://github.com/ethereum/go-ethereum/releases/tag/v1.10.26).
 
 ### Bug Fixes
+* (upgrade) [#1617](https://github.com/evmos/ethermint/pull/1617) Refactor `evm` module's parameters to store them under a single store key
 * (rpc) [#1600](https://github.com/evmos/ethermint/pull/1600) Revert changes from `TypedEvents`
 * (rpc) [#1613](https://github.com/evmos/ethermint/pull/1613) Change the default json-rpc listen address to localhost.
 * (rpc) [#1611](https://github.com/evmos/ethermint/pull/1611) Add missing next fee in fee history, fix wrong oldestBlock and align earliest input as ethereum.