update README

README.md

-[![CircleCI](https://circleci.com/gh/rocker-org/rocker-versioned.svg?style=svg)](https://circleci.com/gh/rocker-org/rocker-versioned) 
-[![license](https://img.shields.io/badge/license-GPLv2-blue.svg)](https://opensource.org/licenses/GPL-2.0)
+[![CircleCI](https://circleci.com/gh/rocker-org/rocker-versioned.svg?style=svg)](https://circleci.com/gh/rocker-org/rocker-versioned) [![license](https://img.shields.io/badge/license-GPLv2-blue.svg)](https://opensource.org/licenses/GPL-2.0)
 
 
-image      | description                               | tags 
----------- | ----------------------------------------  | ---- 
-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 "Get your own image badge on microbadger.com")  [![](https://images.microbadger.com/badges/version/rocker/r-ver.svg)](https://microbadger.com/images/rocker/r-ver "Get your own version badge on microbadger.com") 
-rstudio    |  Adds rstudio                             | [![](https://images.microbadger.com/badges/image/rocker/rstudio.svg)](https://microbadger.com/images/rocker/rstudio "Get your own image badge on microbadger.com")  [![](https://images.microbadger.com/badges/version/rocker/rstudio.svg)](https://microbadger.com/images/rocker/rstudio "Get your own version badge on microbadger.com")  
-tidyverse  |  Adds tidyverse & devtools                | [![](https://images.microbadger.com/badges/image/rocker/tidyverse.svg)](https://microbadger.com/images/rocker/tidyverse "Get your own image badge on microbadger.com")  [![](https://images.microbadger.com/badges/version/rocker/tidyverse.svg)](https://microbadger.com/images/rocker/tidyverse "Get your own version badge on microbadger.com") 
-verse      |  Adds tex & publishing-related packages   | [![](https://images.microbadger.com/badges/image/rocker/verse.svg)](https://microbadger.com/images/rocker/verse "Get your own image badge on microbadger.com")  [![](https://images.microbadger.com/badges/version/rocker/verse.svg)](https://microbadger.com/images/rocker/verse "Get your own version badge on microbadger.com") 
+## Version-stable Rocker images
+
+![rocker](https://avatars0.githubusercontent.com/u/9100160?v=3&s=200)
+
+
+image            | description                               | tags 
+---------------- | ----------------------------------------  | ---- 
+r-ver:3.3.2      |  Version-stable base R & src build tools  | [![](https://images.microbadger.com/badges/image/rocker/r-ver.svg)](https://microbadger.com/images/rocker/r-ver "Get your own image badge on microbadger.com")  
+rstudio:3.3.2    |  Adds rstudio                             | [![](https://images.microbadger.com/badges/image/rocker/rstudio.svg)](https://microbadger.com/images/rocker/rstudio "Get your own image badge on microbadger.com")  
+tidyverse:3.3,2  |  Adds tidyverse & devtools                | [![](https://images.microbadger.com/badges/image/rocker/tidyverse.svg)](https://microbadger.com/images/rocker/tidyverse "Get your own image badge on microbadger.com")  
+verse:3.3.2      |  Adds tex & publishing-related packages   | [![](https://images.microbadger.com/badges/image/rocker/verse.svg)](https://microbadger.com/images/rocker/verse "Get your own image badge on microbadger.com")  
 
 
 Notes
 -----
 
-- All `rocker-versioned` images build on `debian:jessie`, the current stable release of Debian. (`r-base` and all `latest` rocker images build from `debian:testing` and may provide more recent versions of libraries and compilers).
+- To use the versioned images, you must include the R version as the tag in the image name.
+- All `rocker-versioned` images build on `debian:jessie`, the current stable release of Debian. (`r-base` and all `:latest`-tagged rocker images build from `debian:testing` and `debian:unstable` repos, which provide more recent versions of libraries and compilers, but the regular updates to these can break dependent packages).
 - `rstudio` image builds with rstudio v 1.0.44 by default. This can be customized by specifying the desired version in `--build-arg RSTUIO_VERSION=<VERSION>` at build time.
 - `tidyverse` the image sets the default CRAN package repository to the MRAN snapshot of CRAN on the date the image is built.  Consequently all R packages installed on this and subsequen images without specifying an alternate repository will correspond to this same snapshot date. This can be customized with the `--build-dep BUILD_DATE=<DATE>` argument when building the `tidyverse` image locally. This ensures the version of any R package remains the same when this or subsequent docker images are rebuilt from their Dockerfiles.