chore: flake8 formatting fixes

Author: rouilj

roundup/rest.py

@@ -2213,15 +2213,15 @@ def dispatch(self, method, uri, input):
         #   options request to discover supported methods (Allow)
         self.client.setHeader(
             "Access-Control-Expose-Headers",
-            ", ".join( [
+            ", ".join([
                 "X-RateLimit-Limit",
                 "X-RateLimit-Remaining",
                 "X-RateLimit-Reset",
                 "X-RateLimit-Limit-Period",
                 "Retry-After",
                 "Sunset",
                 "Allow",
-            ] )
+            ])
         )
 
         # Allow-Origin must match origin supplied by client. '*' doesn't