add additional_types to current_user_playing_track() (#1193)

Co-authored-by: Sebastian Held <sebastian.held@imst.de>
Co-authored-by: Stéphane Bruckert <stephane.bruckert@gmail.com>

CHANGELOG.md

@@ -11,6 +11,8 @@ Add your changes below.
 
 ### Added
 
+- Adds `additional_types` parameter to retrieve currently playing episode
+
 ### Fixed
 
 ### Removed