added missing named arg

Author: andrewelamb

synapseclient/client.py

@@ -821,7 +821,7 @@ def login(
 
         # Check version before logging in
         if not self.skip_checks:
-            version_check(self.logger)
+            version_check(logger=self.logger)
 
         # Make sure to invalidate the existing session
         self.logout()