Adjust changelog

Author: OGPoyraz

CHANGELOG.md

@@ -7,8 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [Unreleased]
 
 ## [8.1.0]
-### Uncategorized
-- Add permit type schema ([#399](https://github.com/MetaMask/eth-sig-util/pull/399))
+### Added
+- Add `Permit` type to `signTypedData` schema ([#399](https://github.com/MetaMask/eth-sig-util/pull/399))
 
 ## [8.0.0]
 ### Changed