Update CHANGELOG.md

Author: SimenB

CHANGELOG.md

@@ -40,6 +40,7 @@
 
 - `[babel-plugin-jest-hoist]` Use `denylist` instead of the deprecated `blacklist` for Babel 8 support ([#14109](https://github.com/jestjs/jest/pull/14109))
 - `[expect]` Check error instance type for `toThrow/toThrowError` ([#14576](https://github.com/jestjs/jest/pull/14576))
+- `[expect]` Improve diff for failing `expect.objectContaining` ([#15038](https://github.com/jestjs/jest/pull/15038))
 - `[jest-changed-files]` Print underlying errors when VCS commands fail ([#15052](https://github.com/jestjs/jest/pull/15052))
 - `[jest-changed-files]` Abort `sl root` call if output resembles a steam locomotive ([#15053](https://github.com/jestjs/jest/pull/15053))
 - `[jest-circus]` [**BREAKING**] Prevent false test failures caused by promise rejections handled asynchronously ([#14315](https://github.com/jestjs/jest/pull/14315))