[R][CI] R's docker image fails due to incompatibility

[asfimport]

The downloaded source packages are in
        '/tmp/RtmpLu0eiq/downloaded_packages'
v  checking for file '/tmp/RtmpLu0eiq/remotes1a8d7c759a55/romainfrancois-decor-6c5a5aa/DESCRIPTION' ...
-  preparing 'decor':
v  checking DESCRIPTION meta-information ...
-  cleaning src
-  checking for LF line-endings in source and make files and shell scripts
-  checking for empty or unneeded directories
-  building 'decor_0.0.0.9001.tar.gz'
   
Installing package into '/usr/local/lib/R/site-library'
(as 'lib' is unspecified)
ERROR: this R is version 3.4.4, package 'decor' requires R >= 3.5.0
Error: Failed to install 'decor' from GitHub:
  (converted from warning) installation of package '/tmp/RtmpLu0eiq/file1a8d6986708c/decor_0.0.0.9001.tar.gz' had non-zero exit status
Execution halted
ERROR: Service 'r' failed to build: The command '/bin/sh -c Rscript -e "install.packages('devtools', repos = 'http://cran.rstudio.com')" &&     Rscript -e "devtools::install_github('romainfrancois/decor')" &&     Rscript -e "install.packages(c(         'Rcpp', 'dplyr', 'stringr', 'glue', 'vctrs',         'purrr',         'assertthat',         'fs',         'tibble',         'crayon',         'testthat',         'bit64',         'hms',         'lubridate'),         repos = 'https://cran.rstudio.com')"' returned a non-zero code: 1
Makefile.docker:49: recipe for target 'build-r' failed

I'm not sure if the fix is just to bump R's version in the image, or avoid the failing package. cc @romainfrancois

Reporter: Francois Saint-Jacques / @fsaintjacques
Assignee: Neal Richardson / @nealrichardson

_{Note: This issue was originally created as ARROW-5779. Please see the migration documentation for further details.}

[asfimport]

Neal Richardson / @nealrichardson:
Should bump the R version regardless to at least 3.5; 3.6.0 is current release.

[asfimport]

Neal Richardson / @nealrichardson:
We've overhauled the docker files a few times since this is reported