Update of "State of this proposal" pharagraph in https://tc39.github.io/ecmascript-asyncawait/ about proposal-async-await

[DanielHerr]

Both Chrome and Firefox are implementing.

https://bugs.chromium.org/p/v8/issues/detail?id=4483
https://bugzilla.mozilla.org/show_bug.cgi?id=1185106

[chicoxyzzy]

Safari too
https://bugs.webkit.org/show_bug.cgi?id=156147

[bterlson]

Waiting for the second browser implementation as some on the committee feel we need this before advancing this proposal. I will update the text!

[IanVS]

It looks like it moved to stage 4, so I guess the document should be updated? (tc39/proposals@e8c0354)

[bterlson]

Indeed it should be :) I am working on doing the official 262 PR this week and retiring this repo so it should be a non issue soon!

[bterlson]

Actually I just went ahead and did it (forgot I could use the web interface).

[littledan]

Since it's taking some time to get the PR in (understandably, it's huge), would it make sense to update the doc to say it's at Stage 4? This caused some confusion on my team.

[bterlson]

Will do so on Tuesday once I return to work. Although I'm kind of hoping I can get the whole PR done with another day's effort :)