v4.0.0

v4 🎉

• Minimum version of react is now 16.6.0
• New aria best practices implemented
• Add new ARIA role prop that default to dialog
• Add new ARIA ariaLabelledby prop
• Add new ARIA ariaDescribedby prop
• focusTrapped default value is now true
• Upgrade react-transition-group to version 4.X
• Reduce bundle size

Bug fixes

Close #283
Close #239
Close #301