Update postcss-preset-env to the latest version 🚀

[greenkeeper]

The devDependency postcss-preset-env was updated from 6.2.0 to 6.3.0.

This version is not covered by your current version range.

If you don’t accept this pull request, your project will work just like it did before. However, you might be missing out on a bunch of new features, fixes and/or performance improvements from the dependency update.

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Release Notes for 6.3.0

6.3.0 (October 28, 2018)

• Added postcss-double-position-gradients 1.0.0 (major, non-breaking for this project)
• Updated autoprefixer to 9.3.1 (minor)
• Updated browserslist to 4.3.4 (patch)
• Updated caniuse-lite to 1.0.30000899 (patch)
• Updated cssdb to 4.1.0 (major, non-breaking for this project)

6.2.0 (October 22, 2018)

• Updated autoprefixer to 9.2.1 (minor)
• Updated browserslist to 4.3.1 (minor)

Commits

The new version differs by 1 commits.

• 3c91a1b 6.3.0

See the full diff

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