Update dependency less to v3

[renovate]

This Pull Request updates dependency less from v2.7.3 to v3.0.1

Release Notes

v3.0.0

2018-02-10

• Fix calc() function to not do math operations on compile
• Rename Directive -> AtRule & Rule -> Declaration
• Cross-platform @plugin loading! (Node & Browser)
• Numerous changes / improvements to plugin architecture
• Simplified API calls in plugins (less.atrule() vs new less.tree.AtRule())
• Property accessors ($width to refer to width: 300px value)
• Inline JavaScript disabled by default for security reasons (use @plugin)
• Improvements in Less error reporting
• Added feature: returning null / false from Less functions will remove that line
• Simple boolean() and if() functions added
• Bug fixes
• Removal of unnecessary nodes from API (like IE's alpha())

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Commits

v3.0.0

• 0b6536b Merge branch '3.x'
• 9590b7b Add dist files
• 45d06b9 Merge pull request #3163 from matthew-dean/master
• 12fe0c6 Update README.md
• 4962988 Update CHANGELOG.md

v3.0.1

• ba5ad9c Point badges at master branch
• 4272871 Fixes #3116 - lessc not loading plugins in 3.0
• 2f1386f Merge pull request #3168 from matthew-dean/master

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This PR has been generated by Renovate Bot.