[ci skip] Document metrics addition

worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/WorldEditPlugin.java

@@ -223,6 +223,7 @@ public class WorldEditPlugin extends JavaPlugin {
 
         // Enable metrics
         Metrics m = new Metrics(this, BSTATS_ID);
+        // First introduced in build 349, release 2.5.2
         m.addCustomChart(new SimplePie("residence", ()
                 -> WEManager.weManager().getManagers().toString().contains("residence") ? "Yes" : "No"));
         // Check if we are in a safe environment