feat: changelog entry

Author: hstove

CHANGELOG.md

@@ -12,6 +12,7 @@ and this project adheres to the versioning scheme outlined in the [README.md](RE
 - New RPC endpoints
   - `/v2/clarity/marf/:marf_key_hash`
   - `/v2/clarity/metadata/:principal/:contract_name/:clarity_metadata_key`
+- When a proposed block is validated by a node, the block can be validated even when the block version is different than the node's default ([#5539](https://github.com/stacks-network/stacks-core/pull/5539))
 
 ### Changed