Bump less from 2.7.3 to 3.8.1

[dependabot-preview]

Bumps less from 2.7.3 to 3.8.1.

Changelog

Sourced from less's changelog.

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
• New math modes! Also see docs.
• 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

• 5230486 v3.8.1 (#3302)
• 33a3830 Fixes: #3300 (#3301)
• 4e903e8 Demonstrate 3.7 fixes #3160 (#3292)
• a9c69a3 Color function updates - #RRGGBBAA and CSS Variables (#3291)
• 59e919b v3.8.0 (#3293)
• 2d43c0b Feature/rewrite urls (#3248)
• b0228c9 Update CHANGELOG.md
• c9772a0 Release v3.7.1 (#3284)
• ee2d9fd Fix #3281: console.warning → console.warn (#3283)
• c6813b2 Update CHANGELOG.md
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #375.