Update telegram.py to add a delete method

Add an option for delete bar message with the deleteMessage method in Bot API.

tqdm/contrib/telegram.py

@@ -62,6 +62,19 @@ def write(self, s):
         else:
             return future
 
+    def delete(self):
+        try:
+            res = self.submit(
+                self.session.post,
+                self.API + '%s/deleteMessage' % self.token,
+                data=dict(
+                    chat_id=self.chat_id,
+                    message_id=self.message_id))
+        except Exception as e:
+            tqdm_auto.write(str(e))
+        else:
+            return res            
+
 
 class tqdm_telegram(tqdm_auto):
     """
@@ -112,6 +125,9 @@ def clear(self, *args, **kwargs):
         if not self.disable:
             self.tgio.write("")
 
+    def delete(self):
+        self.tgio.delete()            
+
 
 def ttgrange(*args, **kwargs):
     """