add download function

Author: EinDev

urbackup_api/__init__.py

@@ -473,8 +473,9 @@ def download_backup_file(self, clientid, backupid, path="/"):
 
         if response.status != 200:
             return None
-
-        return response
+        data = response.read()
+        response.close()
+        return data
 
     def get_groups(self):
         if not self.login():