Added button "Trello"

Added button "Trello" to database seeder.

This is required for buttons to show up in the kinks/buttons list on the Admin Panel. 
All buttons added here will be added by the built-in updater.

Author: JulianPrieber

database/seeders/ButtonSeeder.php

@@ -150,6 +150,10 @@ public function run()
 			'name' => 'tumblr'
             ],
 
+            [
+			'name' => 'trello'
+            ],
+            
             [
 			'name' => 'twitch'
             ],