Release 12.3.0

[shawnbot]

Primer Minor Release

Version: 📦 12.3.0
Approximate release date: 📆 04/30/19

🚀 Enhancement

• More fine-grained (as in, all) color utilities More color utilities! #760
• PINK! 💖🌸💕🌷💞🎀💗🌺👚💝 Add Pink to Primer! 💖🌸💕🌷💞🎀💗🌺👚💝 #776 Add More Pink to Primer! 💖🌸💕🌷💞🎀💗🌺💝 #778

📝 Documentation

Tons of documentation fixes from @emplums:

• Update @primer/blueprints Update Blueprints #764
• Add anchor links to headings Anchor Link in Docs #768
• Add edit links Add Edit on GitHub links to docs #770
• Change project name references to "Primer" to "Primer CSS" Update Primer references to Primer CSS #771

🏠 Internal

• Add bundle size report Add bundle size report #772
• Update RELEASING guide Update RELEASING #757

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Ship checklist

• Update CHANGELOG.md
• Update the version field in package.json to match the release version
• Create a new release
• Update github/github
• Create a new pull request for the next release

/cc @primer/ds-core

[emplums]

🚢 IT!!! 🎀