use deleteWebhook in Updater._bootstrap

jh0ker · jh0ker · commit fc9f36d4db52 · 2017-01-16T00:00:27.000+01:00
diff --git a/telegram/ext/updater.py b/telegram/ext/updater.py
@@ -328,7 +328,7 @@ def _bootstrap(self, max_retries, clean, webhook_url, cert=None):
             try:
                 if clean:
                     # Disable webhook for cleaning
-                    self.bot.setWebhook(webhook_url='')
+                    self.bot.deleteWebhook()
                     self._clean_updates()
                     sleep(1)
 
