[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

src/servestatic/responders.py

@@ -326,7 +326,7 @@ def get_response(self, method, request_headers):
         if query_string and self.preserve_query_string:
             headers = list(self.response.headers)
             name, value = headers[-1]
-            value = "{}?{}".format(value, query_string)
+            value = f"{value}?{query_string}"
             headers[-1] = (name, value)
             return Response(self.response.status, headers, None)
         return self.response