Changelog 2.7.0 (#679)

* add v2.7.0 changlog

* add v2.7.0 changlog

* oracle 2.0

* optimize some update

CHANGELOG.md

@@ -35,6 +35,24 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 # Changelog
 
+## [v2.7.0] - 04-11-2023
+Version 2.7.0 brings Oracle 2.0, which offers security evaluation for transactions running on business chains.
+
+### State Machine Breaking Changes
+* (x/gov) [\#651](https://github.com/shentufoundation/shentu/pull/651) Achieve the compatibility with Cosmos gov interface by removing customized implementation from the gov module.
+
+### Features
+* (x/oracle) [\#613](https://github.com/shentufoundation/shentu/pull/613) Introducing Oracle 2.0 to provide trusted scoring for other on-chain business transactions.
+
+### Improvements
+* (app) [\#646](https://github.com/shentufoundation/shentu/pull/646) Upgrade cosmos-sdk from v0.45.9 to v0.45.11 and tendermint from v0.34.21 to v0.34.23
+* (app) [\#599](https://github.com/shentufoundation/shentu/pull/599)  Upgrade IBC to v4.2.0
+* (x/oracle) [\#639](https://github.com/shentufoundation/shentu/pull/639)  Add remaining bounty refund feature in oracle module.
+* (app) [\#633](https://github.com/shentufoundation/shentu/pull/633)  Improve go deps and proto gen.
+
+### Bug Fixes
+* (x/shield) [\#563](https://github.com/shentufoundation/shentu/pull/563) Fix shield service fees bug.
+
 ## [v2.6.0] - 10-21-2022
 
 ### Client Breaking Changes