Neutrino CSSNext preset

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neutrino-preset-cssnext is a Neutrino preset that adds support for
[cssnext][cssnext].

Documentation

Install this preset to your development dependencies, then set it in
.neutrinorc.js:

``javascript
module.exports = {
use: [
"neutrino-preset-web",
"neutrino-preset-cssnext",
],
...
};
`

You can configure the features through options object, following the
instructions at [cssnext documentation][cssnext-browserslist] and the
[Browserslist query syntax][browserslist-docs]).

This is an example using options:

`javascript
module.exports = {
use: [
"neutrino-preset-web",
["neutrino-preset-cssnext", {
browsers: ["> 1%", "last 2 versions"],
}],
],
...
};
``

Breaking Changes

Bumping to Neutrino 6 and cssnext 3.
The most meaningful change is in image-set polyfill.
See https://github.com/MoOx/postcss-cssnext/releases/tag/3.0.0

[cssnext]: http://cssnext.io/
[cssnext-browserslist]: http://cssnext.io/usage/#browsers
[postcss-middleware]: https://npmjs.org/package/neutrino-middleware-postcss
[browserslist-docs]: https://github.com/ai/browserslist#queries
[npm-image]: https://img.shields.io/npm/v/neutrino-preset-cssnext.svg
[npm-downloads]: https://img.shields.io/npm/dt/neutrino-preset-cssnext.svg
[npm-url]: https://npmjs.org/package/neutrino-preset-cssnext
[slack-image]: https://neutrino-slack.herokuapp.com/badge.svg
[slack-url]: https://neutrino-slack.herokuapp.com/