func (m *memcached) Delete(key string) error {
	return m.driver.Delete(key)
}
Delete the cached key from Memcached storage
package memcached
import (
	"time"
	"github.com/bradfitz/gomemcache/memcache"
	"github.com/faabiosr/cachego"
)
type memcached struct {
	driver *memcache.Client
}
func New(driver *memcache.Client) cachego.Cache {
	return &memcached{driver}
}
func (m *memcached) Contains(key string) bool {
	_, err := m.Fetch(key)
	return err == nil
}