Deprecate statsRegistry(..) builder-method

Author: kagkarlsson

db-scheduler/src/main/java/com/github/kagkarlsson/scheduler/SchedulerBuilder.java

@@ -133,6 +133,10 @@ public SchedulerBuilder housekeeperExecutor(ScheduledExecutorService housekeeper
     return this;
   }
 
+  /**
+   * Deprecated, use addSchedulerListener instead
+   */
+  @Deprecated
   public SchedulerBuilder statsRegistry(StatsRegistry statsRegistry) {
     this.statsRegistry = statsRegistry;
     return this;