fix(render): remove repeated static check. (#998)

render/render.go

@@ -24,7 +24,6 @@ var (
 	_ HTMLRender = HTMLProduction{}
 	_ Render     = YAML{}
 	_ Render     = MsgPack{}
-	_ Render     = MsgPack{}
 )
 
 func writeContentType(w http.ResponseWriter, value []string) {