10up-toolkit v2

10up-toolkit

• Updated several dependencies.
• Updated to postcss-preset-env 7.0 and switched from postcss-nested to postcss-nesting [BREAKING CHANGE]
• Disable polyfill for CSS custom properties.
• Removed wordpress/jest-preset-default and now shipping a custom jest config. Jest has also been updated to the latest version.
• Removed: IE 11 support. [BREAKING CHANGE]

babel-preset-default

• Removed: IE 11 support. [BREAKING CHANGE]
• Updated dependencies

eslint-config

• Updated dependencies

stylelint-config

• updated dependencies
• Change Stylelint configuration to allow color properties to use any of the global CSS values without a variable.

Migrating from v1

• 10up-toolkit no longs ships code compatible with IE 11, if you're currently supporting IE 11 you will need to drop support for IE 11 or manually modify the webpack and babel config (not recommended)
• postcss-preset-env has been updated to 7.0 and postcss-nested has been replaced with postcss-nesting. If your project uses postcss-nested syntax, you will need to update it to be compatible with postcss-nesting syntax.

props @nicholasio @rdimascio @Antonio-Laguna @ian-pvd