Update cran-comments

.Rbuildignore

@@ -18,3 +18,6 @@ Makefile
 ^\.lintr$
 ^CRAN-RELEASE$
 ^\.github$
+^revdep$
+^pkgdown$
+^CRAN-SUBMISSION$

cran-comments.md

@@ -1,19 +1,18 @@
 ## Submission
 
-This submission resolves issues on the CRAN check page.
+This submission resolves issues in the CRAN check results.
 
 ## Test environments
-* local ubuntu 18.04 install, R 3.6.3
-* ubuntu 16.04 (on GitHub actions), R 4.0.0, R 3.6.3, R 3.5.3
-* macOS (on GitHub actions), R-devel, R 4.0.0
-* windows (on GitHub actions), R 3.6.3
-* win-builder, R-devel, R 4.0.0, R 3.6.3
+* local ubuntu 20.04 install, R 4.1.2
+* ubuntu-latest (on GitHub actions), R-devel, R-release, R-oldrel
+* macOS (on GitHub actions), R-release
+* windows (on GitHub actions), R-release
+* win-builder, R-devel
 
 ## R CMD check results
 
 0 errors | 0 warnings | 0 notes
 
-## revdep checks
+## Revdep checks
 
-All revdeps have been checked, and no package check results are changed to 
-worse.
+All reverse dependencies have been checked, none have changed to worse.