Update changelog

Author: jpuri

CHANGELOG.md

@@ -7,8 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [Unreleased]
 
 ## [4.2.0]
-### Uncategorized
-- Remove error throw when response is seen for unknown request ([#32](https://github.com/MetaMask/json-rpc-middleware-stream/pull/32))
+### Changed
+- Change error throw when response is seen for unknown request into warning displayed in console([#32](https://github.com/MetaMask/json-rpc-middleware-stream/pull/32))
 
 ## [4.1.0]
 ### Changed