Feature/async mappers Result & Maybe

[ChrisHadar]

I've added methods to both Result and Maybe which will automatically unwrap and wrap Promises with more intuitive behavior when mapping async functions

[patrickmichalina]

@ChrisHadar Thanks. It is going to be a little bit before I fully review this. I am swamped at the moment and need to carve some time to think about this and the approach. Thanks!

[greym0uth]

This looks really good to me: has tests, no breaking changes, and very useful. You think you would have time @patrickmichalina at some point to review this?

[patrickmichalina]

@greym0uth this PR contains async/await which is not something I would want in a lazily evaluated library. Because I see that I have not focused on getting this reviewed. But thanks for the reminder and I will try to pencil it in.

[greym0uth]

@patrickmichalina Ah I see yea, perhaps @ChrisHadar could change it to use promises instead of the async/await keywords then?

[greym0uth]

Also @patrickmichalina why don't you want async/await keywords? It's been a core feature of typescript since 2.1 and since these are TS files anything evaluating them should have async/await keyword support. Rollup can polyfill the build if it doesn't already (I think it translates to promises in the resulting JS already).

[vermiculus]

Hi folks -- is there anything I can do to help move this PR forward? We're at the point of potentially maintaining our own version of this package in order to support this syntax.

[patrickmichalina]

@vermiculus I will try get this over the fence