I've reconsidered await in all the examples/Readme

[malgorithms]

I previously suggested to @nathunsmitty and @thebearjew in #45 that we shouldn't use super modern Node features like that in our example code, but it's just become so ubiquitous, and honestly await is so much better than dealing with promises directly. So for now on I think it's fine just to use them in our examples.

Feel free to close this issue, just writing it here...