Merge branch 'change/readme-stable-branch' into 'develop'

Update README.md for stable branch

See merge request !227

README.md

@@ -11,7 +11,7 @@ Admin UI for pleroma instance owners.
 There are two main branches here:
 
 - `develop`: ongoing work and all merge requests go here, *unstable*
-- `master`: after `develop` is stabilized it is merged to `master`, `master` is *stable*, allegedly
+- `stable`: after `develop` is stabilized it is merged to `stable`, *stable*, allegedly
 
 ### Features