Re-knit readme

Author: hadley

README.md

@@ -3,7 +3,7 @@
 stringr <img src="logo.png" align="right" />
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-[![Build Status](https://travis-ci.org/tidyverse/stringr.svg?branch=master)](https://travis-ci.org/tidyverse/stringr) [![Coverage Status](https://img.shields.io/codecov/c/github/tidyverse/stringr/master.svg)](https://codecov.io/github/tidyverse/stringr?branch=master) [![CRAN Status](http://www.r-pkg.org/badges/version/stringr)](http://cran.r-project.org/package=stringr)
+[![Build Status](https://travis-ci.org/tidyverse/stringr.svg?branch=master)](https://travis-ci.org/tidyverse/stringr) [![Coverage Status](https://img.shields.io/codecov/c/github/tidyverse/stringr/master.svg)](https://codecov.io/github/tidyverse/stringr?branch=master) [![CRAN Status](http://www.r-pkg.org/badges/version/stringr)](https://cran.r-project.org/package=stringr)
 
 Overview
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