Restored Shiny Server version to its current v.
As explained in discussion on the pull request (https://github.com/jupyter/repo2docker/pull/803#issuecomment-538013605), I restored the Shiny Server version to its current version on Binder, and thus only left RStudio being updated.
MODIFY
repo2docker/buildpacks/r.py
repo2docker/buildpacks/r.py
@@ -207,8 +207,8 @@ class RBuildPack(PythonBuildPack):
rstudio_checksum = "d33881b9ab786c09556c410e7dc477de"
# Via https://www.rstudio.com/products/shiny/download-server/
- shiny_url = "https://download3.rstudio.org/ubuntu-14.04/x86_64/shiny-server-1.5.12.933-amd64.deb"
- shiny_checksum = "9aeef6613e7f58f21c97a4600921340e"
+ shiny_url = "https://download3.rstudio.org/ubuntu-14.04/x86_64/shiny-server-1.5.7.907-amd64.deb"
+ shiny_checksum = "78371a8361ba0e7fec44edd2b8e425ac"
# Version of MRAN to pull devtools from.
devtools_version = "2018-02-01"

Restored Shiny Server version to its current v.

As explained in discussion on the pull request (https://github.com/jupyter/repo2docker/pull/803#issuecomment-538013605), I restored the Shiny Server version to its current version on Binder, and thus only left RStudio being updated.