player swaps hands event

docs/scarpet/api/Events.md

@@ -34,6 +34,7 @@ __on_player_places_block(player, item_tuple, hand, block) // player have just pl
 __on_player_interacts_with_entity(player, entity, hand)
 __on_player_chooses_recipe(player, recipe, full_stack)
 __on_player_switches_slot(player, from, to)
+__on_player_swaps_hands(player)
 __on_player_attacks_entity(player, entity)
 __on_player_takes_damage(player, amount, source, source_entity)
 __on_player_deals_damage(player, amount, entity)