Remove getServerName()

Sponge/src/main/java/com/plotsquared/sponge/SpongeMain.java

@@ -293,11 +293,6 @@ public class SpongeMain implements IPlotMain {
         Sponge.getEventManager().registerListeners(this, new WorldEvents());
     }
 
-    @Override
-    public String getServerName() {
-        throw new UnsupportedOperationException("NOT IMPLEMENTED YET");
-    }
-
     @Override
     public void startMetrics() {
         SpongeMetrics metrics = new SpongeMetrics(this.game, this.plugin);