Update dependency grunt-contrib-sass to v2

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
grunt-contrib-sass	1.0.0 -> 2.0.0

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Release Notes

gruntjs/grunt-contrib-sass (grunt-contrib-sass)

v2.0.0

Compare Source

• Merge pull request #​259 from gruntjs/upt-deps-3 ede3adf
• v2.0.0 changelog 0630c1e
• Bump some dependencies 4274480
• Merge pull request #​258 from gruntjs/dependabot/npm_and_yarn/lodash-4.17.20 44b0860
• Merge pull request #​257 from gruntjs/dependabot/npm_and_yarn/underscore.string-3.3.5 6f07e49
• Bump lodash from 4.17.15 to 4.17.20 6d8c550
• Bump underscore.string from 3.3.4 to 3.3.5 c09853e
• Merge pull request #​256 from gruntjs/update-ci b67504c
• Update CI targets 9da4296
• Merge pull request #​252 from gruntjs/dependabot/npm_and_yarn/lodash-4.17.15 3602226
• Bump lodash from 4.17.10 to 4.17.15 409b019
• Merge pull request #​248 from gruntjs/dev e1f8664
• Update all deps, drop Node.js < 6 support, and update links. f98c38c
• Upgrade grunt and devDeps to 1.0. 4d56455
• Update AppVeyor config. be8205a
• Fix tests on Windows. 519d4d2
• Update CHANGELOG. fe81ce8
• Add Appveyor for Windows testing. fe1308a
• Update dependencies. eb295c5

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