Storybook 5.1 - June 2019

Storybook 5.1 is a juicy upgrade including:


5.1 contains hundreds more fixes, features, and tweaks. Browse the changelogs matching 5.1.0-alpha.*, 5.1.0-beta.*, and 5.1.0-rc.* for the full list of changes. See MIGRATION.md to upgrade from 5.0 or earlier.