docs: Update changelog for v2.0.1 release (#409)

Author: spencer-tb

docs/CHANGELOG.md

@@ -4,7 +4,9 @@ Test fixtures for use by clients are available for each release on the [Github r
 
 **Key:** ✨ = New, 🐞 = Fixed, 🔀 = Changed, 💥 = Breaking change.
 
-## [v2.0.1](https://github.com/ethereum/execution-spec-tests/releases/tag/v2.0.1) - 20XX-XX-XX: Unreleased
+## [v2.1.0](https://github.com/ethereum/execution-spec-tests/releases/tag/v2.1.0) - 2024-01-29: 🐍🏖️ Cancun
+
+Release [v2.1.0](https://github.com/ethereum/execution-spec-tests/releases/tag/v2.1.0) primarily fixes a small bug introduced within the previous release where transition forks are used within the new `StateTest` format. This was highlighted by @chfast within #405 (https://github.com/ethereum/execution-spec-tests/issues/405), where the fork name `ShanghaiToCancunAtTime15k` was found within state tests.
 
 ### 🧪 Test Cases
 
@@ -18,8 +20,6 @@ Test fixtures for use by clients are available for each release on the [Github r
 
 - ✨ Use `run-parallel` and shared wheel packages for `tox` ([#408](https://github.com/ethereum/execution-spec-tests/pull/408)).
 
-### 💥 Breaking Changes
-
 ## [v2.0.0](https://github.com/ethereum/execution-spec-tests/releases/tag/v2.0.0) - 2024-01-25: 🐍🏖️ Cancun
 
 Release [v2.0.0](https://github.com/ethereum/execution-spec-tests/releases/tag/v2.0.0) contains many important framework changes, including introduction of the `StateTest` format, and some additional Cancun and other test coverage.

whitelist.txt

@@ -44,6 +44,7 @@ cancun
 cd
 chainid
 changelog
+chfast
 classdict
 cli2
 codeAddr