chore(dependencies): update dependency node-sass to 4.13.x

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
node-sass	devDependencies	minor	4.12.x -> 4.13.x

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Release Notes

sass/node-sass

### [`v4.13.0`](https://togithub.com/sass/node-sass/blob/master/CHANGELOG.md#v4130) [Compare Source](https://togithub.com/sass/node-sass/compare/v4.12.0...v4.13.0)

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[codecov[bot]]

Codecov Report

Merging #145 into develop will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           develop    #145   +/-   ##
=======================================
  Coverage     99.1%   99.1%           
=======================================
  Files           14      14           
  Lines          447     447           
  Branches        71      71           
=======================================
  Hits           443     443           
  Misses           4       4

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