allow await blocks in slots

[Rich-Harris]

fixes #1014

[codecov-io]

Codecov Report

Merging #1018 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master    #1018   +/-   ##
=======================================
  Coverage   92.08%   92.08%           
=======================================
  Files         115      115           
  Lines        4297     4297           
  Branches     1369     1368    -1     
=======================================
  Hits         3957     3957           
  Misses        147      147           
  Partials      193      193

Impacted Files	Coverage Δ
src/generators/nodes/Text.ts	100% <ø> (ø)	⬆️
src/generators/nodes/AwaitBlock.ts	95.52% <100%> (ø)	⬆️

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