Format to Daddy code style

src/main/java/me/clip/placeholderapi/expansion/Cleanable.java

@@ -31,10 +31,10 @@ import org.bukkit.entity.Player;
  */
 public interface Cleanable {
 
-    /**
-     * Called when a player leaves the server
-     *
-     * @param p (@link Player} who left the server
-     */
-    void cleanup(Player p);
+  /**
+   * Called when a player leaves the server
+   *
+   * @param p (@link Player} who left the server
+   */
+  void cleanup(Player p);
 }