Speak and Export methods should be promises

[tlhunter]

Both the .speak() and .export() methods should accept a callback or return a promise if the callback is missing.

[deanrad]

I love it, just made something like it:

      let getNextSaying = (text) => () => {
        return new Promise(resolve => {
          console.log(`Speaking ${text} ..`)
          say.speak(text, "Good News", 1.0, resolve)
        })
      }

      currentSpeakingIsOver = currentSpeakingIsOver.then(getNextSaying(action.payload))

Also - on Windows I'm not sure the promise truly waits for the first to be over.. It could be the OS reports back sooner than the speech finishes - got any confirmation on that?

[tlhunter]

@deanius I'm unfamiliar with how say works with Windows. Can you create a separate issue?

[deanrad]

@tlhunter - Yes I'll try and keep you posted - a few quirks I'm noticing, but don't have a minimal repro yet..