v0.31.0

What's Changed

• Improve prefer-style-directive by @ota-meshi in #125
• Add no-shorthand-style-property-overrides rule by @ota-meshi in #126
• Add no-dupe-style-properties rule by @ota-meshi in #127
• Add no-unknown-style-directive-property rule by @ota-meshi in #128
• Add no-non-optimized-style-attributes rule by @ota-meshi in #129
• Update preset config.

Full Changelog: v0.30.0...v0.31.0