Update CRAN comments

Author: alexpghayes

cran-comments.md

@@ -1,9 +1,11 @@
+This is a minor maintenance release.
+
 ## Test environments
 
-* local R installation (ubuntu 20.04), R 4.2
-* MacOS (on Github Actions), R 4.2
-* Windows (on Github Actions), R 4.2 R 3.6
-* Ubuntu (on Github Actions), R devel, R 4.2, 4.1, 4.0, 3.6
+* local R installation (ubuntu 22), R 4.2
+* MacOS (on Github Actions), R 4.3
+* Windows (on Github Actions), R 4.3, 4.1, 3.6
+* Ubuntu (on Github Actions), R devel, R 4.3, 4.2, 4.1, 4.0, 3.6
 
 ## R CMD check results