Updated to latest safe deps

[Akkuma]

exportGlobals was just added to postcss-modules, which I need, but I updated the deps simultaneously w/o letting the tests fail.

[codecov]

Codecov Report

Merging #290 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #290   +/-   ##
=======================================
  Coverage   92.47%   92.47%           
=======================================
  Files          10       10           
  Lines         319      319           
  Branches      112      112           
=======================================
  Hits          295      295           
  Misses         23       23           
  Partials        1        1           

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[Akkuma]

As an fyi, updating rollup/bili seems to break rollup-plugin-postcss tests

[benmccann]

duplicate of #310

[wardpeet]

Thanks for your PR and sorry for the delay, it seems that #342 already fixes this.