upgrade R to R 3.5.1

[eddelbuettel]

pretty standard update; my commit comment below should have said R 3.5.1

diff should be minimal, Docker hun build fine as usual

[yosifkit]

Diff:

diff --git a/_bashbrew-list b/_bashbrew-list
index b03fe7f..d9f8bea 100644
--- a/_bashbrew-list
+++ b/_bashbrew-list
@@ -1,2 +1,2 @@
-r-base:3.5.0
+r-base:3.5.1
 r-base:latest
diff --git a/r-base_latest/Dockerfile b/r-base_latest/Dockerfile
index 4b24f87..0c8c5ea 100644
--- a/r-base_latest/Dockerfile
+++ b/r-base_latest/Dockerfile
@@ -38,7 +38,7 @@ ENV LANG en_US.UTF-8
 RUN echo "deb http://http.debian.net/debian sid main" > /etc/apt/sources.list.d/debian-unstable.list \
         && echo 'APT::Default-Release "testing";' > /etc/apt/apt.conf.d/default 
 
-ENV R_BASE_VERSION 3.5.0
+ENV R_BASE_VERSION 3.5.1
 
 ## Now install R and littler, and create a link for littler in /usr/local/bin
 ## Also set a default CRAN repo, and make sure littler knows about it too

[yosifkit]

Build test of #4551; c0bf548; amd64 (r-base):

$ bashbrew build r-base:3.5.1
Building bashbrew/cache:c8cd4c386c809da3f6ad268908286ecef3c74a656a8a08fdafe9502331923b41 (r-base:3.5.1)
Tagging r-base:3.5.1
Tagging r-base:latest

$ test/run.sh r-base:3.5.1
testing r-base:3.5.1
	'utc' [1/4]...passed
	'cve-2014--shellshock' [2/4]...passed
	'no-hard-coded-passwords' [3/4]...passed
	'override-cmd' [4/4]...passed