fix: examples/http-swagger

broken by #628

fixes #634

examples/http-swagger/src/example/server.clj

@@ -77,7 +77,7 @@
        {:get {:summary "downloads a file"
               :swagger {:produces ["image/png"]}
               :responses {200 {:description "an image"
-                               :content {"image/png" any?}}}
+                               :content {"image/png" {:schema any?}}}}
               :handler (fn [_]
                          {:status 200
                           :headers {"Content-Type" "image/png"}