Re: [whatwg/dom] Consider adding Promise-based API for listerning event (#333)

What makes that any different than what you can do already? It's fairly easy to pull into a utility function.

```js
function on(elem, type) {
    return new Promise(resolve => {
        elem.addEventListener(type, function listener(ev) {
            this.removeEventListener(type, listener, false)
            resolve(ev)
        }, false)
    })
}
```

And given the new `once` option, I seriously doubt such a thing is worth it.

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