Same changes as https://github.com/postcss/gulp-postcss/releases/tag/9.1.0, published with the major version bump because of a breaking change.

Deprecated, republished as 10.0.0 to follow semver, because of the breaking change to drop support for node <18

• Bump postcss-load-config to ^5.0.0
• Ensure options are passed to plugins when using postcss.config.js #170
• Update deps
• Drop support for node <18
• Add flake.nix for local dev with nix develop

• Bump postcss-load-config to ^3.0.0

• Bump PostCSS to 8.0
• Drop Node 6 support
• PostCSS is now a peer dependency

• Bump PostCSS to 7.0
• Drop Node 4 support

• Drop dependency on gulp-util

• Bump PostCSS to 6.0
• Smaller module size
• Use eslint instead of jshint

• Add more details to PluginError object

• Integrated with postcss-load-config
• Added a callback to configure postcss on per-file-basis
• Dropped node 0.10 support

• Fix syntax error message for PostCSS 5.2 compatibility