update CHANGELOG

Author: randy-cro

CHANGELOG.md

@@ -2,7 +2,7 @@
 
 ## UNRELEASED
 
-* [#1907](https://github.com/crypto-org-chain/cronos/pull/1907) perf: Optimize staking endblocker with an in-memory KV store and standardize gas consumption for staking related messages
+* [#1907](https://github.com/crypto-org-chain/cronos/pull/1907) fix: Optimize staking endblocker with an in-memory KV store and standardize gas consumption for staking related messages
 * [#1869](https://github.com/crypto-org-chain/cronos/pull/1869) Add missing tx context during vm initialisation
 * [#1872](https://github.com/crypto-org-chain/cronos/pull/1872) Support 4byteTracer for tracer
 * [#1875](https://github.com/crypto-org-chain/cronos/pull/1875) Support for preinstalls