Update the release date and add config error in changelog

CHANGELOG.md

@@ -1,10 +1,11 @@
 # Changelog
 
-## 0.9.0 - 2024-09-03
+## 0.9.0 - 2024-09-11
 - ⚠️ **BREAKING** Add the `BUILDKITE_SPLITTER_RESULT_PATH` required environment variable. See [Migrating to 0.9.0](https://github.com/buildkite/test-splitter/tree/db4cab8cd6c82392553cd80481cf75e3888c2f4c?tab=readme-ov-file#migrating-to-090).
 - Experimental support for Jest by setting `BUILDKITE_SPLITTER_TEST_RUNNER` to `jest`.
 - Update the retry behavior to only retry failed tests.
 - Update split-by-example behavior to perform more work server-side.
+- Improve configuration error message.
 - Fix issue printing dry-run errors.
 - Fix issue with `BUILDKITE_STEP_ID` presence validation.