Bumped protocol version to 20.

src/main/java/com/onarandombox/MultiverseCore/MultiverseCore.java

@@ -123,7 +123,7 @@ import java.util.logging.Level;
  * The implementation of the Multiverse-{@link Core}.
  */
 public class MultiverseCore extends JavaPlugin implements MVPlugin, Core {
-    private static final int PROTOCOL = 19;
+    private static final int PROTOCOL = 20;
     // TODO: Investigate if this one is really needed to be static.
     // Doubt it. -- FernFerret
     private static Map<String, String> teleportQueue = new HashMap<String, String>();