[main] update changelog (#8334)

Author: dibarbet

CHANGELOG.md

@@ -6,6 +6,9 @@
 # 2.81.x
 
 # 2.80.x
+* Fix license link in marketplace (PR: [#8318](https://github.com/dotnet/vscode-csharp/pull/8318))
+* Localization (PR: [#8309](https://github.com/dotnet/vscode-csharp/pull/8309))
+* Re-enabling and stabilizing completion tests (PR: [#8306](https://github.com/dotnet/vscode-csharp/pull/8306))
 
 # 2.79.x
 * Bump Roslyn to 5.0.0-1.25266.2 (PR: [#8298](https://github.com/dotnet/vscode-csharp/pull/8298))