Behavior change in --use option in beta about postcss-cli

[RyanZim]

@wincent This was an intentional change. In v2, if you wanted to set multiple plugins, you had to do:

postcss <input file> --use postcss-cssnext --use autoprefixer

In v3, you can do:

postcss <input file> --use postcss-cssnext autoprefixer

This should be documented in the release notes and migration guide, though. Thanks for bringing this to my attention.

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FWIW, you can also do:

postcss --use postcss-cssnext autoprefixer -- <input file>

if you prefer the files at the end.

[RyanZim]

Docs are fixed.