chore(package): update @kadira/storybook to version 2.20.0
chore(package): update @kadira/storybook to version 2.20.0

https://greenkeeper.io/
bigassdragon/storybook,storybooks/storybook,enjoylife/storybook,shilman/storybook,bigassdragon/storybook,storybooks/react-storybook,kadirahq/react-storybook,enjoylife/storybook,rhalff/storybook,storybooks/storybook,rhalff/storybook,storybooks/react-storybook,shilman/storybook,rhalff/storybook,nfl/react-storybook,storybooks/storybook,bigassdragon/storybook,nfl/react-storybook,rhalff/storybook,rhalff/storybook,storybooks/storybook,kadirahq/react-storybook,storybooks/storybook,rhalff/storybook,shilman/storybook,bigassdragon/storybook,storybooks/storybook,shilman/storybook,enjoylife/storybook,jribeiro/storybook,nfl/react-storybook,jribeiro/storybook,enjoylife/storybook,storybooks/storybook,storybooks/react-storybook,nfl/react-storybook,jribeiro/storybook,jribeiro/storybook,storybooks/react-storybook