docs: clarify MTP v2 support in CHANGELOG

Updated changelog to reflect MTP v2 support and breaking changes.

Author: codito

CHANGELOG.md

@@ -8,7 +8,8 @@ simplicity. For v3.x changelogs, refer to the end of this document.
 
 ### ⚠ BREAKING CHANGES
 
-* use MTP v2 in testlogger ([#214](https://github.com/spekt/testlogger/issues/214))
+* MTP v2 support ([#214](https://github.com/spekt/testlogger/issues/214))
+  Version 8.x will support MTP v2 and VSTest. Use 7.x for MTP v1 runner.
 
 ### Features