Update CRAN comments

Author: hadley

cran-comments.md

@@ -3,9 +3,4 @@ There were no ERRORs, WARNINGs or NOTEs.
 
 ## revdepcheck results
 
-We checked 458 reverse dependencies (389 from CRAN + 69 from Bioconductor), comparing R CMD check results across CRAN and dev versions of this package.
-
- * We saw 3 new problems: I provided a patch to doctest and informed
-   checkhelper and attachment maintainers on December 13.
- 
- * We failed to check 2 packages: rstanarm and valse.
+I did not check revdeps since the small bug fixes I made did not cause failures on previous submission.