Merge pull request #3080 from JayAndCatchFire/hotfix/background-addon…

…-readme

Fix inconsistencies in the background add-on README

addons/background/README.md

@@ -3,13 +3,13 @@
 [![Build Status on CircleCI](https://circleci.com/gh/storybooks/storybook.svg?style=shield)](https://circleci.com/gh/storybooks/storybook)
 [![CodeFactor](https://www.codefactor.io/repository/github/storybooks/storybook/badge)](https://www.codefactor.io/repository/github/storybooks/storybook)
 [![Known Vulnerabilities](https://snyk.io/test/github/storybooks/storybook/8f36abfd6697e58cd76df3526b52e4b9dc894847/badge.svg)](https://snyk.io/test/github/storybooks/storybook/8f36abfd6697e58cd76df3526b52e4b9dc894847)
-[![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)  
+[![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://now-examples-slackin-rrirkqohko.now.sh/badge.svg)](https://now-examples-slackin-rrirkqohko.now.sh/)
 [![Backers on Open Collective](https://opencollective.com/storybook/backers/badge.svg)](#backers) [![Sponsors on Open Collective](https://opencollective.com/storybook/sponsors/badge.svg)](#sponsors)
 
 * * *
 
-Storybook Centered Decorator can be used to center components inside the preview in [Storybook](https://storybook.js.org).
+Storybook Background Addon can be used to change background colors inside the preview in [Storybook](https://storybook.js.org).
 
 [Framework Support](https://github.com/storybooks/storybook/blob/master/ADDONS_SUPPORT.md)
 
@@ -18,7 +18,7 @@ Storybook Centered Decorator can be used to center components inside the preview
 ## Installation
 
 ```sh
-npm i --save @storybook/addon-backgrounds
+npm i -D @storybook/addon-backgrounds
 ```
 
 ## Configuration