Increase earlierst supported version to 3.5.1

because some dependencies are not met in 3.5.0

.gitlab-ci.yml

@@ -9,9 +9,9 @@
     - R -e 'devtools::install_deps(quiet = TRUE)'
     - R -e 'devtools::check(error_on = "note")'
 
-# Earliest supported version as specified in DESCRIPTION
-check-3.5.0:
-  image: rocker/tidyverse:3.5.0
+# Earliest supported version
+check-3.5.1:
+  image: rocker/tidyverse:3.5.1
   <<: *check_job_template
 
 # Last version before 4.0.0

DESCRIPTION

@@ -25,7 +25,7 @@ URL: https://git.ufz.de/oekotox/stressaddition
 Encoding: UTF-8
 LazyData: true
 Depends:
-    R (>= 3.5)
+    R (> 3.5.0)
 Imports: 
     drc (>= 3.0),
     plotrix