Merge pull request #1112 from nunit/adapter60Update

Adapter version 6.0.0 update engine compatibility

Author: OsirisTerje

docs/articles/vs-test-adapter/Adapter-Engine-Compatibility.md

@@ -15,7 +15,7 @@ post.
 
 | Adapter version | Embedded engine version |
 | --------------- | ----------------------- |
-| 6.0.0           | 3.20.2                  |
+| 6.0.0           | 3.21.0                  |
 | 5.2.0           | 3.18.1                  |
 | 5.1.0           | 3.18.1                  |
 | 5.0.0           | 3.18.1                  |