Babel 7 code should use @babel/parser

[stof]

Currently, the code uses the babylon old package.

[stof]

What is the actual state of fast-async for babel 7 ? Is is considered stable ?

[matAtWork]

It's "stable", but at the time it was last updated, babel 7 was not. For me, it's in a maintenance phase (I don't use babel in my projects any more). I'd be happy to accept a PR if you think it would be useful for other users