README is misleading: cannot compose from value

[OliverJAsh]

The README suggests you can import a file and then use the identifier in a composes value, e,g,:

@value foo: "./foo.css";
.bar {
  composes: baz from foo;
}

However, this errors with:

referenced class name "from" in composes not found

[OliverJAsh]

Related issues:

• chore(deps-dev): bump postcss from 8.1.1 to 8.2.10 postcss-modules-values#20
• https://github.com/css-modules/postcss-modules-values/issues/83

[OliverJAsh]

Turns out the issue was further upstream in css-loader, which depends on this module.

Issue: webpack-contrib/css-loader#533
PR to fix: webpack-contrib/css-loader#534