Update README.md

Author: roshangade

README.md

@@ -54,7 +54,7 @@ api.Error("UNAUTHORIZED", func(ctx *rest.Context) {
 
 fmt.Println("Starting server.")
 
-http.ListenAndServe(":8080", api)
+http.ListenAndServe(":8080", &api)
 ```
 
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