fix(deps): update dependency postcss-pxtorem to v6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss-pxtorem	^5.1.1 -> ^6.0.0

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Release Notes

cuth/postcss-pxtorem

v6.0.0

Compare Source

Breaking Changes

• Update to PostCSS 8, now you need to install postcss-pxtorem by npm install postcss postcss-pxtorem --save-dev (#​68)

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Configuration

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[codecov]

Codecov Report

Merging #222 (779e198) into develop (5825f21) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #222   +/-   ##
========================================
  Coverage    95.68%   95.68%           
========================================
  Files           31       31           
  Lines          232      232           
  Branches        68       68           
========================================
  Hits           222      222           
  Misses           7        7           
  Partials         3        3           

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