add "async await on stable rust!" blog post

[nikomatsakis]

This should be posted after #440

[rust-highfive]

r? @alexcrichton

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[tesuji]

Link for this?

[Mark-Simulacrum]

If this is published today then that seems a bit too early - I'd rather publish it next week, say Tuesday, or maybe even Friday (not sure what would work best).

[alexcrichton]

r? @nikomatsakis

[nikomatsakis]

OK, I incorporated the last few comments and renamed the file to tomorrow's date (2019-11-07).

[nikomatsakis]

I pushed a final commit that attempts to give thanks to the key folks who've worked on the async-await design + implementation. I always feel nervous writing these things, since I'm worried I'll overlook someone, and this time more than most, since I've not been that closely involved until the last six months or so. But it feels like an important thing to do. If you feel I've overlooked someone who played a big role in the design or implementation of async-await, feel free to ping me discretely... :)