add store.umd.js

[Rich-Harris]

fixes #967

[codecov-io]

Codecov Report

Merging #1045 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1045      +/-   ##
==========================================
+ Coverage   91.99%   92.01%   +0.01%     
==========================================
  Files         119      119              
  Lines        4361     4370       +9     
  Branches     1406     1408       +2     
==========================================
+ Hits         4012     4021       +9     
  Misses        148      148              
  Partials      201      201

Impacted Files	Coverage Δ
src/parse/index.ts	90.21% <0%> (+1.06%)	⬆️

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[Conduitry]

Is there some reason we want the UMD build tracked in the repo? That seems a bit odd.

[Rich-Harris]

Oversight! Fixed — good catch, thanks