docs: added release notes for 4.20.X release

docs/release-notes/release-notes-4.20.0.rst

@@ -0,0 +1,74 @@
+|RCE| 4.20.0 |RNS|
+------------------
+
+Release Date
+^^^^^^^^^^^^
+
+- 2020-07-20
+
+
+New Features
+^^^^^^^^^^^^
+
+- Comments: users can now edit comments body.
+  Editing is versioned and all older versions are kept for auditing.
+- Pull requests: changed the order of close-branch after merge,
+  so branch heads are no longer left open after the merge.
+- Diffs: added diff navigation to improve UX when browsing the full context diffs.
+- Emails: set the `References` header for threading in emails with different subjects.
+  Only some Email clients supports this.
+- Emails: added logic to allow overwriting the default email titles via rcextensions.
+- Markdown: support summary/details tags to allow setting a link with expansion menu.
+- Integrations: added `store_file` integration. This allows storing
+  selected files from repository on disk on push.
+
+
+General
+^^^^^^^
+
+- License: individual users can hide license flash messages warning about upcoming
+  license expiration.
+- Downloads: the default download commit is now the landing revision set in repo settings.
+- Auth-tokens: expose all roles with explanation to help users understand it better.
+- Pull requests: make auto generated title for pull requests show also source Ref type
+  eg. branch feature1, instead of just name of the branch.
+- UI: added secondary action instead of two buttons on files page, and download page.
+- Emails: reduce excessive warning logs on pre-mailer.
+
+
+Security
+^^^^^^^^
+
+- Branch permissions: protect from XSS on branch rules forbidden flash message.
+
+
+Performance
+^^^^^^^^^^^
+
+
+
+Fixes
+^^^^^
+
+- Pull requests: detect missing commits on diffs from new PR ancestor logic. This fixes
+  problem with older PRs opened before 4.19.X that had special ancestor set, which could
+  lead in some cases to crash when viewing older pull requests.
+- Permissions: fixed a case when a duplicate permission made repository settings active on archived repository.
+- Permissions: fixed missing user info on global and repository permissions pages.
+- Permissions: allow users to update settings for repository groups they still own,
+  or have admin perms, when they don't change their name.
+- Permissions: flush all when running remap and rescan.
+- Repositories: fixed a bug for repo groups that didn't pre-fill the repo group from GET param.
+- Repositories: allow updating repository settings for users without
+  store-in-root permissions in case repository name didn't change.
+- Comments: fixed line display icons.
+- Summary: fixed summary page total commits count.
+
+
+Upgrade notes
+^^^^^^^^^^^^^
+
+- Schedule feature update.
+- On Mercurial repositories we changed the order of commits when the close branch on merge features is used.
+  Before the commits was made after a merge leaving an open head.
+  This backward incompatible change now reverses that order, which is the correct way of doing it.

docs/release-notes/release-notes.rst

@@ -9,6 +9,7 @@ Release Notes
 .. toctree::
    :maxdepth: 1
 
+   release-notes-4.20.0.rst
    release-notes-4.19.3.rst
    release-notes-4.19.2.rst
    release-notes-4.19.1.rst