Turns out they changed to a new tag for MSAL. Fix #539

Author: rayluo

setup.cfg

@@ -5,5 +5,5 @@ universal=1
 project_urls =
     Changelog = https://github.com/AzureAD/microsoft-authentication-library-for-python/releases
     Documentation = https://msal-python.readthedocs.io/
-    Questions = https://stackoverflow.com/questions/tagged/msal+python
+    Questions = https://stackoverflow.com/questions/tagged/azure-ad-msal+python
     Feature/Bug Tracker = https://github.com/AzureAD/microsoft-authentication-library-for-python/issues