Add changelog for 0.20.9

fastlane/metadata/android/en-US/changelogs/963.txt

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+• Added support for chapters in player controls
+• [PeerTube] Added Sepia search
+• Re-added share button in video detail view and moved stream description into the tab layout
+• Disable restoring brightness if brightness gesture is disabled
+• Added list item to play video on kodi
+• Fixed crash when no default browser is set on some devices and improve share dialogs
+• Toggle play/pause with hardware space button in fullscreen player
+• [media.ccc.de] Various fixes and improvements