evaluate each block key in child scope

[Rich-Harris]

fixes #1397

[Conduitry]

At first I was wondering why this was passing in Travis and not Appveyor - but it looks like for some reason the tests are not actually being run in Appveyor? I'm not sure what to make of that build log

[Rich-Harris]

Yeah, I just spotted the exact same thing. Raised an issue for it. Weird

[codecov-io]

Codecov Report

Merging #1402 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master    #1402   +/-   ##
=======================================
  Coverage   91.25%   91.25%           
=======================================
  Files         122      122           
  Lines        4485     4485           
  Branches     1385     1385           
=======================================
  Hits         4093     4093           
  Misses        154      154           
  Partials      238      238

Impacted Files	Coverage Δ
src/compile/nodes/EachBlock.ts	98.65% <100%> (ø)	⬆️

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