flash.go
func (f Flash) persist(session *Session) {
	b, _ := json.Marshal(f.data)
	session.Set(flashKey, b)
	session.Save()
}
func (f Flash) persist(session *Session) {
	b, _ := json.Marshal(f.data)
	session.Set(flashKey, b)
	session.Save()
}
func ( f Flash ) persist ( session * Session ) { b , _ := json . Marshal ( f . data ) session . Set ( flashKey , b ) session . Save ( ) }
//Persist the flash inside the session.
Persist the flash inside the session .