Remove async/await

[Rich-Harris]

Currently, Sapper requires Node 8, which means you can't run it on AWS Lambda and what-have-you

[EmilTholin]

Would you like to remove async/await from the tests as well?

[Rich-Harris]

I suppose we'd need to, if we're to guard against regressions. If we're not testing on Node 6 it'd be very easy to accidentally stop supporting it

[thgh]

I would vote to use @std/esm instead. Not sure what the performance impact would be on Lambda.

[Rich-Harris]

@thgh @std/esm is just about supporting import and export, it doesn't have any bearing on whether async and await can be used. This issue should be closed though, it was fixed in #67