Changelog for 0.86.0 (#5882)

* Changelog for 0.86.0

* More info on outdated comment action

Author: alexr00

CHANGELOG.md

@@ -1,5 +1,28 @@
 # Changelog
 
+## 0.86.0
+
+### Changes
+
+- The new `auto` value for `githubPullRequests.createDefaultBaseBranch` will use the upstream's default branch as the base branch for fork repositories.
+- Outdated comments now show a badge in the Comments view.
+
+  ![Outdated comment in view](./documentation/changelog/0.86.0/outdated-comment.png)
+- Colors for checks and Xs on PR page. https://github.com/microsoft/vscode-pull-request-github/issues/5754
+- Comment threads in the Comments view now have inline actions and context menu actions. Outdated comments have a "Diff Comment with HEAD" action which is particularly useful for understanding what changed on an outdated comment.
+
+  ![Comment thread context menu](./documentation/changelog/0.86.0/context-menu-comment.png)
+  ![Comment thread inline actions](./documentation/changelog/0.86.0/inline-action-comments-view.png)
+
+### Fixes
+
+- Trim leading whitespace in PR description. https://github.com/microsoft/vscode-pull-request-github/issues/5780
+- Flickering When Editing A Comment. https://github.com/microsoft/vscode-pull-request-github/issues/5762
+
+## 0.84.0
+
+- There is no extension version 0.84.0 because of a version increase mistake.
+
 ## 0.82.0
 
 ### Changes