context.go
func (ctx *Context) DeleteSession() error {
	sid := ctx.Data["Sid"].(string)
	ctx.Data["session"] = nil
	provider.Destroy(sid)
	cookie := httpCookie
	cookie.MaxAge = -1
	http.SetCookie(ctx.ResponseWriter, &cookie)
	return nil
}
func (ctx *Context) DeleteSession() error {
	sid := ctx.Data["Sid"].(string)
	ctx.Data["session"] = nil
	provider.Destroy(sid)
	cookie := httpCookie
	cookie.MaxAge = -1
	http.SetCookie(ctx.ResponseWriter, &cookie)
	return nil
}
// DeleteSession delete session