docs: update changelog

docs/CHANGELOG.md

@@ -43,6 +43,7 @@ Test fixtures for use by clients are available for each release on the [Github r
 - ✨ Add a new covariant marker `with_all_contract_creating_tx_types` that allows automatic parametrization of a test with all contract-creating transaction types at the current executing fork ([#602](https://github.com/ethereum/execution-spec-tests/pull/602)).
 - ✨ Tests are now encouraged to declare a `pre: Alloc` parameter to get the pre-allocation object for the test, and use `pre.deploy_contract` and `pre.fund_eoa` to deploy contracts and fund accounts respectively, instead of declaring the `pre` as a dictionary or modifying its contents directly (see the [state test tutorial](https://ethereum.github.io/execution-spec-tests/main/tutorials/state_transition/) for an updated example) ([#584](https://github.com/ethereum/execution-spec-tests/pull/584)).
 - ✨ Enable loading of [ethereum/tests/BlockchainTests](https://github.com/ethereum/tests/tree/develop/BlockchainTests) ([#596](https://github.com/ethereum/execution-spec-tests/pull/596)).
+- ✨ Write a properties file to the output directory and enable direct generation of a fixture tarball from `fill` via `--output=fixtures.tgz`([#627](https://github.com/ethereum/execution-spec-tests/pull/627)).
 
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