Update to version 8.5.5

Former-commit-id: b5be58709f17758a8df3ebc99270b97ccd8b18f2

_examples/cache/simple/main.go

@@ -58,7 +58,7 @@ All features of Sundown are supported, including:
 // Cache is a good and a must-feature on static content, i.e "about page" or for a whole blog site.
 func main() {
 	app := iris.New()
-
+	app.Logger().SetLevel("debug")
 	app.Get("/", cache.Handler(10*time.Second), writeMarkdown)
 	// saves its content on the first request and serves it instead of re-calculating the content.
 	// After 10 seconds it will be cleared and resetted.