Merge pull request #583 from robatipoor/master

add hasAudio and hasVoice method in Message class

telegrambots-meta/src/main/java/org/telegram/telegrambots/meta/api/objects/Message.java

@@ -381,6 +381,14 @@ public class Message implements BotApiObject {
         return this.video != null;
     }
 
+    public boolean hasAudio(){
+        return this.audio != null;
+    }
+
+    public boolean hasVoice(){
+        return this.voice != null;
+    }
+
     public boolean isReply() {
         return this.replyToMessage != null;
     }