update changelog

CHANGELOG.md

@@ -7,13 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [Unreleased]
 
 ## [12.1.0]
-### Uncategorized
+### Added
 - Add `signatureMethod` property to `MessageParams` ([#273](https://github.com/MetaMask/eth-json-rpc-middleware/pull/273))
-- Bump @metamask/eth-sig-util from 7.0.0 to 7.0.1 ([#272](https://github.com/MetaMask/eth-json-rpc-middleware/pull/272))
-- Bump @metamask/eth-json-rpc-provider from 2.2.0 to 2.3.0 ([#269](https://github.com/MetaMask/eth-json-rpc-middleware/pull/269))
-- Bump @metamask/auto-changelog from 3.4.2 to 3.4.3 ([#268](https://github.com/MetaMask/eth-json-rpc-middleware/pull/268))
-- Bump @metamask/json-rpc-engine from 7.2.0 to 7.3.0 ([#271](https://github.com/MetaMask/eth-json-rpc-middleware/pull/271))
-- Bump @metamask/utils from 8.2.0 to 8.2.1 ([#270](https://github.com/MetaMask/eth-json-rpc-middleware/pull/270))
 
 ## [12.0.1]
 ### Changed