chore(docs): v3.0.0 changelog (#697)

* chore(docs): changelog

* fix(docs): emoji

docs/CHANGELOG.md

@@ -4,7 +4,7 @@ Test fixtures for use by clients are available for each release on the [Github r
 
 **Key:** ✨ = New, 🐞 = Fixed, 🔀 = Changed, 💥 = Breaking change.
 
-## 🔜 [Unreleased](https://github.com/ethereum/execution-spec-tests/releases/tag/v-Unreleased) - 2024-xx-xx
+## [v3.0.0](https://github.com/ethereum/execution-spec-tests/releases/tag/v3.0.0) - 2024-07-22
 
 ### 🧪 Test Cases
 
@@ -77,7 +77,7 @@ Test fixtures for use by clients are available for each release on the [Github r
 - The "Blockchain Test Hive" fixture format has been renamed to "Blockchain Test Engine" and updated to more closely resemble the `engine_newPayload` format in the `execution-apis` specification (https://github.com/ethereum/execution-apis/blob/main/src/engine/prague.md#request) and now contains a single `"params"` field instead of multiple fields for each parameter ([#687](https://github.com/ethereum/execution-spec-tests/pull/687)).
 - Output folder for fixtures has been renamed from "blockchain_tests_hive" to "blockchain_tests_engine" ([#687](https://github.com/ethereum/execution-spec-tests/pull/687)).
 
-## 🔜 [v2.1.1](https://github.com/ethereum/execution-spec-tests/releases/tag/v2.1.1) - 2024-03-09
+## [v2.1.1](https://github.com/ethereum/execution-spec-tests/releases/tag/v2.1.1) - 2024-03-09
 
 ### 🧪 Test Cases