Update less requirement from ^2.5.1 to ^3.8.1

[dependabot-preview[bot]]

Updates the requirements on less to permit the latest version.

Changelog

*Sourced from [less's changelog](https://github.com/less/less.js/blob/master/CHANGELOG.md).* > ## 3.8.1 > > 2018-08-07 > - Fixes for sourcemaps and color functions > - Support for #RRGGBBAA color format > - Allows conversion of colors to `rgba()` or `hsla()` > - Pass-through output of unknown properties in color functions (allows `var(--color)` for example) > > ## 3.8.0 > > 2018-07-22 > - New feature: added rewrite urls to replace relative url option. Adds "local" option for modules > > ## 3.7.1 > > 2018-07-11 > - Fixes mistake in `lessc` (using `console.warning` instead of actual `console.warn`) > - Adds `lessc` tests > > ## 3.7.0 > > 2018-07-11 > - New each() function! [See docs](http://lesscss.org/functions/#list-functions-each) > - New math modes! Also [see docs](http://lesscss.org/usage/#less-options-math). > - Bug fixes > > ## 3.6.0 > > 2018-07-10 > - Allows plain conditions in `if(true, 1, 2)` (vs. `if((true), 1, 2)`) > - Fixes svg-gradient() for Firefox > - Adds more 3rd-party tests for fewer surprises when upgrading > - Removes (broken) `less-rhino` implementation - use other Java ports > > ## 3.5.3 > > 2018-07-06 > - Reverts `[**media**](https://github.com/media)` eval change > - Other bug fixes > > ## 3.5.0 > > 2018-07-05 > - Feature: Namespaced Values / Maps e.g. `color: [**color**](https://github.com/color)[primary]` > - Fixes to calc() > - Permissive parsing of custom properties and variables > - Inline expressions now not evaluated in at-rules `[**media**](https://github.com/media) (min-width: [**var**](https://github.com/var)) {}` works, `[**media**](https://github.com/media) (min-width: [**var**](https://github.com/var) + 1) {}` will not > - Allows unnamed lookups i.e. "functions" e.g. `.mixin([**a**](https://github.com/a), [**b**](https://github.com/b))[]` > - Lots of bug fixes > > ... (truncated)

Commits

- See full diff in [compare view](https://github.com/less/less.js/commits/v3.8.1)

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[tomap]

This repo has no build/test. We should not merge before we add some tests

[dependabot-preview[bot]]

Superseded by #17.