Compared to previous versions:

* cssparser-macros contains a preformance improvement that does not affect its public API, so this new version is semver-compatible
* cssparser-color has cssparser types in its public API, so this propagates the semver-incompatibility of cssparser 0.38

This follows https://github.com/servo/rust-cssparser/pull/442, with intent to publish all three crates immediately.

Signed-off-by: Simon Sapin <simon@igalia.com>