docs: add changelog.

Author: spencer-tb

docs/CHANGELOG.md

@@ -17,6 +17,7 @@ Test fixtures for use by clients are available for each release on the [Github r
 - ✨ Update [EIP-6110](https://eips.ethereum.org/EIPS/eip-6110), [EIP-7002](https://eips.ethereum.org/EIPS/eip-7002), [EIP-7251](https://eips.ethereum.org/EIPS/eip-7251), [EIP-7685](https://eips.ethereum.org/EIPS/eip-7685), and [EIP-7702](https://eips.ethereum.org/EIPS/eip-7702) tests for Devnet-4 ([#832](https://github.com/ethereum/execution-spec-tests/pull/832))
 - ✨ [EIP-7702](https://eips.ethereum.org/EIPS/eip-7702) many delegations test ([#923](https://github.com/ethereum/execution-spec-tests/pull/923))
 - ✨ [EIP-7702](https://eips.ethereum.org/EIPS/eip-7702) set code of non-empty-storage account test ([#948](https://github.com/ethereum/execution-spec-tests/pull/948))
+- ✨ [EIP-7742: Uncouple blob count between CL and EL](https://eips.ethereum.org/EIPS/eip-7742) initial test cases ([#986](https://github.com/ethereum/execution-spec-tests/pull/986))
 
 ### 🛠️ Framework