zulip: Replace deprecated distro.linux_distribution.

Signed-off-by: Anders Kaseorg <anders@zulip.com>

Author: andersk

zulip/zulip/__init__.py

@@ -548,7 +548,8 @@ def get_user_agent(self) -> str:
             pass
 
         if vendor == "Linux":
-            vendor, vendor_version, dummy = distro.linux_distribution()
+            vendor = distro.name()
+            vendor_version = distro.version()
         elif vendor == "Windows":
             vendor_version = platform.win32_ver()[1]
         elif vendor == "Darwin":