add channel region changing logging

src/main/java/cc/fascinated/bat/service/EventService.java

@@ -498,4 +498,13 @@ public class EventService extends ListenerAdapter {
             listener.onChannelUpdateUserLimit(guild, event);
         }
     }
+
+    @Override
+    public void onChannelUpdateRegion(@NotNull ChannelUpdateRegionEvent event) {
+        BatGuild guild = guildService.getGuild(event.getGuild().getId());
+
+        for (EventListener listener : LISTENERS) {
+            listener.onChannelUpdateRegion(guild, event);
+        }
+    }
 }