v3.5.0

Enhancements

• Update build toolchain to use Babel v7, PostCSS v7 and Rollup v1. Update our build targets match our supported browsers, leading to a reduction in bundle size (#837)

Bug fixes

• Ensure disabled Button components with a url prop output valid HTML (#773)
• Fixed DropZone which was unable to add a duplicate file back to back or add a file again once removed #782. Thank you @jzsplk for the contribution #425 and @vladucu for the clear example.
• Added a fallback to the safeAreaFor sass mixin to handle browsers that don't support env and constant (#881)

Documentation

• Added deprecation guidelines (#853)

Development workflow

• Replaced our home-grown playground with Storybook (still accessed through yarn dev) (#768)
• Removed our usage of babel-node for build scripts - use plain node instead (#836)
• Ensure CSS builds are reproducible (#869)