Add changelog for 0.23.1

fastlane/metadata/android/en-US/changelogs/987.txt

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+New
+• Support delivery methods other than progressive HTTP: faster playback loading time, fixes for PeerTube and SoundCloud, playback of recently-ended YouTube livestreams
+• Add button to add a remote playlist to a local one
+• Image preview in Android 10+ share sheet
+
+Improved
+• Improve playback parameters dialog
+• Move subscription import/export buttons to three-dot menu
+
+Fixed
+• Fix removing fully watched videos from playlist
+• Fix share menu theme and "add to playlist" entry