Check R version 3.5.0 and 3.6.3, closes #40

3.5.0 beacause it is the earliest supported version as specified in DESCRIPTION. 3.6.3 because it is the last version before 4.0.0

.gitlab-ci.yml

@@ -9,9 +9,14 @@
     - R -e 'devtools::install_deps(quiet = TRUE)'
     - R -e 'devtools::check(error_on = "note")'
 
-# latest version of the previous minor R release
-check-previous:
-  image: rocker/tidyverse:3.5.3
+# Earliest supported version as specified in DESCRIPTION
+check-3.5.0:
+  image: rocker/tidyverse:3.5.0
+  <<: *check_job_template
+
+# Last version before 4.0.0
+check-3.6.3:
+  image: rocker/tidyverse:3.6.3
   <<: *check_job_template
 
 # latest R release