[Snyk] Security upgrade postcss-cli from 2.6.0 to 7.0.0

[snyk-bot]

Snyk has created this PR to fix one or more vulnerable packages in the `npm` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • package.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Issue	Breaking Change	Exploit Maturity
	Prototype Pollution SNYK-JS-YARGSPARSER-560381	Yes	Proof of Concept

Commit messages

Package name: postcss-cli

The new version differs by 244 commits.

• 745ad2c 7.0.0
• cf6ea09 Update eslint config
• ea1cec4 Update eslint-config-problems to version 3.1.0 (#306)
• 1519430 Update globby to version 10.0.1 (#303)
• 5b47456 Update eslint to version 6.8.0 (#305)
• e241672 Update nyc to version 15.0.0 (#297)
• 4a87ff1 Update chalk to version 3.0.0 (#294)
• e666505 Update prettier to version 1.19.1 (#304)
• 0d3591a Update ava to version 2.4.0 (#302)
• cb9f451 Update fs-extra to version 8.1.0 (#301)
• 4f68a46 Update chokidar to version 3.3.0 (#300)
• 5c22ddb Update yargs to version 15.0.2 (#298)
• 79eb0ac Update get-stdin to version 7.0.0 (#273)
• 71384c6 Update Travis config; remove AppVeyor
• 6b92df3 BREAKING: Drop Node 6 & 8; test on new Node versions
• 7091819 6.1.3
• 0de7ccf Fix map file path creation (#286)
• f1c7352 Update prettier to version 1.18.0 (#281)
• 035bab8 Update nyc to version 14.0.0 (#274)
• 541048e Update prettier to version 1.17.0 (#272)
• 8fd79b0 6.1.2
• 72376fc Upgrade prettier to ~1.16.4
• 87a7286 Update globby to v9.0.0 (#270)
• c079cff Test Node 10 & 11

See the full diff

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