update cran comments

Author: Filip Schouwenaars

cran-comments.md

@@ -1,7 +1,7 @@
 ## Test environments
 
 * local OS X install, R 3.3.0
-* ubuntu 12.04 (on travis-ci), R 3.3.0
+* ubuntu 12.04 (on travis-ci, oldrel, release and devel)
 * win-builder (release, devel)
 
 ## R CMD check results
@@ -14,4 +14,4 @@ There are no packages depending on this package yet.
 
 ## Other notes
 
-Build vignettes
+None.