context.go
func (ctx *Context) FreshSession(key string) error {
	err := provider.UpExpire(key)
	if err != nil {
		return err
	}
	return nil
}
func (ctx *Context) FreshSession(key string) error {
	err := provider.UpExpire(key)
	if err != nil {
		return err
	}
	return nil
}
// FreshSession set session