Echo JS 0.11.0

Kinda cool, but again reinventing and rewriting same things again and again.

/user/tracker1, /user/antonvs:
There is almost everything needed in the PromiseFun [1] collection by Sindre.

[1] https://github.com/sindresorhus/promise-fun

It would be good to extract the `find` and `findIndex` as `p-find` and `p-find-index` for example :)

For some reasons, I built `each-promise` instead of using `p-map`, `p-map-series` and `p-settle`.

Now I'm wondering if there's a promise version of the `async` library.