add flight time (#62)

src/main/resources/config.yml

@@ -81,6 +81,7 @@ enabled:
   dropped-by: true
   elytra-tag: true
   arrows-shot: true
+  flight-time: true
 
 messages:
   created:
@@ -110,6 +111,7 @@ messages:
   dropped-by: "&7Dropped by: &8{name}" # name will be player/mob name
   damage-taken: "&7Damage taken: &8{damage}"
   arrows-shot: "&7Arrows shot: &8{arrows}"
+  flight-time: "&7Flight time: &8{time}"
   # Display this message if the player shift click trades/crafts items. It's not really easy to get every single item
   # that is crafted. The tag will only be added to the first item. If you don't want this message, simply replace them both with ""
   shift-click-warning: