await...then shorthand

[Rich-Harris]

fixes #957

[codecov-io]

Codecov Report

Merging #1001 into master will increase coverage by 0.15%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1001      +/-   ##
==========================================
+ Coverage   91.99%   92.14%   +0.15%     
==========================================
  Files         115      115              
  Lines        4271     4420     +149     
  Branches     1359     1434      +75     
==========================================
+ Hits         3929     4073     +144     
- Misses        148      149       +1     
- Partials      194      198       +4

Impacted Files	Coverage Δ
src/parse/state/mustache.ts	89.3% <100%> (+0.41%)	⬆️
src/generators/server-side-rendering/index.ts	96.92% <0%> (-1.16%)	⬇️
src/generators/nodes/Component.ts	94.38% <0%> (-0.48%)	⬇️
src/generators/Generator.ts	94.89% <0%> (+0.5%)	⬆️
src/css/Selector.ts	93.41% <0%> (+0.79%)	⬆️
src/validate/html/a11y.ts	96.38% <0%> (+1.44%)	⬆️

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