As per #fdroid-dev:
+mvdan | paresh: look at what lint says
+mvdan | src/main/res/transition-v21/app_list_item_click.xml:2: The resource R.transition.app_list_item_click appears to be unused
+mvdan | are you aware of this?
paresh | mvdan, oh yes
paresh | it is useless
paresh | I think I planned on adding some transition
paresh | you can remove it safely