Upgrade deps to enable postcss 8

[isaacl]

Fixes #324

[codecov]

Codecov Report

Merging #335 (9d0a3e2) into master (661c9ca) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #335   +/-   ##
=======================================
  Coverage   92.68%   92.68%           
=======================================
  Files          10       10           
  Lines         328      328           
  Branches      115      115           
=======================================
  Hits          304      304           
  Misses         23       23           
  Partials        1        1           

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[ai]

LGTM

[softbeehive]

Hey folks, is there a blocker? I wonder why it hasn't been approved yet

[softbeehive]

Do you need to bump version manually? 3.1.8 was published in August, I assume next release including these changes will actually have a different version

[spacedawwwg]

Good to see this one go in

[danielbarion]

I'm very excited and waiting for this PR, nice!

[SASUKE40]

Is this PR a duplicate of the previous one ？
#325

[ai]

It is an improvement for #325

We need to update postcss-load-config to be able to load PostCSS 8 plugins.

[SASUKE40]

I upgraded it in another pr, and migrated the noop postcss plug-in.

[wardpeet]

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