Make Promise as return of method update() or new method updatePromise()

[dvilker]

For example:

methods: {
  async refresh() {
    let openedId = this.opened.id
    await this.$asyncComputed.items.updatePromise()
    this.opened = this.items.find(x => x.id === openedId)
  },
  // or
  async refresh() {
    let openedId = this.opened.id
    let items = await this.$asyncComputed.items.updatePromise()
    this.opened = items.find(x => x.id === openedId)
  },
}

Sorry for my English.