Merge branch 'master' into jest-updated

README.md

@@ -2,7 +2,7 @@
 [![Greenkeeper badge](https://badges.greenkeeper.io/storybooks/storybook.svg)](https://greenkeeper.io/)
 [![Build Status](https://travis-ci.org/storybooks/storybook.svg?branch=master)](https://travis-ci.org/storybooks/storybook)
 [![CodeFactor](https://www.codefactor.io/repository/github/storybooks/storybook/badge)](https://www.codefactor.io/repository/github/storybooks/storybook)
-[![BCH compliance](https://bettercodehub.com/edge/badge/storybooks/storybook)](https://bettercodehub.com/results/storybooks/storybook)  
+[![BCH compliance](https://bettercodehub.com/edge/badge/storybooks/storybook)](https://bettercodehub.com/results/storybooks/storybook) [![codecov](https://codecov.io/gh/storybooks/storybook/branch/master/graph/badge.svg)](https://codecov.io/gh/storybooks/storybook)  
 [![Storybook Slack](https://storybooks-slackin.herokuapp.com/badge.svg)](https://storybooks-slackin.herokuapp.com/)
 
 Storybook is a development environment for React UI components. It allows you to browse a component library, view the different states of each component, and interactively develop and test components.