docs: update readme to include a notice for the correct release.

README.md

@@ -2,6 +2,11 @@
 
 Smart playlists with Lisp filter engine.
 
+This readme contains instructions for the most recent changes in
+the development branch (`main`). To view the file appropriate
+for your version select the tag corresponding to your version.
+The latest version is [v0.2.0.0](https://gitea.redxef.at/redxef/jellyfin-smart-playlist/src/tag/v0.2.0.0).
+
 ## How to use
 
 After [installing](#installation) the plugin and restarting Jellyfin
@@ -92,6 +97,9 @@ to: `(is-favourite)`.
   allowed, the example filter would match the genre "Nu-Metal" (`(is-genre "metal" (genre-list))`)
 - **is-genre-exact**: the same as `is-genre`, but does not match paritally
 - **is-favorite**: matches a favorite item (`(is-favorite)`)
+- **is-type**: matches the type of item look at
+  [BaseItemKind.cs](https://github.com/jellyfin/jellyfin/blob/master/Jellyfin.Data/Enums/BaseItemKind.cs)
+  for a list of items. The plugin has enabled support for `Audio, MusicAlbum, Playlist` (`(is-type "Audio")`)
 
 ### Filename