add virtual to ping schedule methods (#45)

Author: vu-luong

socket/EzyPingSchedule.cs

@@ -23,7 +23,7 @@ public EzyPingSchedule(EzyClient client)
 
 		}
 
-		public void start()
+		public virtual void start()
 		{
             lock(this) 
             {
@@ -38,7 +38,7 @@ private EzyScheduleAtFixedRate newSchedule() {
             return answer;
         }
 
-		public void stop()
+		public virtual void stop()
 		{
             lock (this)
             {
@@ -68,7 +68,7 @@ private void sendPingRequest()
 			}
 		}
 
-        public void setSocketEventQueue(EzySocketEventQueue socketEventQueue)
+        public virtual void setSocketEventQueue(EzySocketEventQueue socketEventQueue)
         {
             this.socketEventQueue = socketEventQueue;
         }