Merge pull request #251 from Bisaloo/patch-1

Add missing link

README.md

@@ -17,7 +17,7 @@ Visit [rocker-project.org](https://rocker-project.org) for more about available
 image            | description                               | size   | metrics | build status 
 ---------------- | ----------------------------------------- | ------ | ------- | --------------
 [r-ver](https://hub.docker.com/r/rocker/r-ver)            |  Version-stable base R & src build tools  | [![](https://images.microbadger.com/badges/image/rocker/r-ver.svg)](https://microbadger.com/images/rocker/r-ver) | [![](https://img.shields.io/docker/pulls/rocker/r-ver.svg)](https://hub.docker.com/r/rocker/r-ver) |  [![](https://img.shields.io/docker/automated/rocker/r-ver.svg)](https://hub.docker.com/r/rocker/r-ver/builds)
-[rstudio](https://hub.docker.com/r/rocker/rstudio)          |  Adds rstudio                             | [![](https://images.microbadger.com/badges/image/rocker/rstudio-stable.svg)](https://microbadger.com/) | [![](https://img.shields.io/docker/pulls/rocker/rstudio.svg)](https://hub.docker.com/r/rocker/rstudio)  |  [![](https://img.shields.io/docker/automated/rocker/rstudio.svg)](https://hub.docker.com/r/rocker/rstudio/builds)
+[rstudio](https://hub.docker.com/r/rocker/rstudio)          |  Adds rstudio                             | [![](https://images.microbadger.com/badges/image/rocker/rstudio-stable.svg)](https://microbadger.com/images/rocker/rstudio) | [![](https://img.shields.io/docker/pulls/rocker/rstudio.svg)](https://hub.docker.com/r/rocker/rstudio)  |  [![](https://img.shields.io/docker/automated/rocker/rstudio.svg)](https://hub.docker.com/r/rocker/rstudio/builds)
 [tidyverse](https://hub.docker.com/r/rocker/tidyverse)        |  Adds tidyverse & devtools                | [![](https://images.microbadger.com/badges/image/rocker/tidyverse.svg)](https://microbadger.com/images/rocker/tidyverse) | [![](https://img.shields.io/docker/pulls/rocker/tidyverse.svg)](https://hub.docker.com/r/rocker/tidyverse) |  [![](https://img.shields.io/docker/automated/rocker/tidyverse.svg)](https://hub.docker.com/r/rocker/tidyverse/builds) 
 [verse](https://hub.docker.com/r/rocker/verse)            |  Adds tex & publishing-related packages   | [![](https://images.microbadger.com/badges/image/rocker/verse.svg)](https://microbadger.com/images/rocker/verse) | [![](https://img.shields.io/docker/pulls/rocker/verse.svg)](https://hub.docker.com/r/rocker/verse) | [![](https://img.shields.io/docker/automated/rocker/verse.svg)](https://hub.docker.com/r/rocker/verse/builds)