Update CRAN comments

Author: lionel-

cran-comments.md

@@ -1,17 +1,35 @@
-This version fixes the error on Solaris and the failures with the new
-ggplot2 update. It should be more robust to this kind of errors from
-now on.
+This version fixes the errors on systems featuring FreeType 2.8.0. It
+should also fix packages depending on vdiffr, such as ggstance.
+
+The win-builder checks failed with this error:
+
+```
+Error in svglite_(file, bg, width, height, pointsize, standalone, aliases) :
+  function 'gdtools_RcppExport_validate' not provided by package 'gdtools'
+```
+
+However I cannot reproduce this error on Appveyor or on R hub.
+
 
 ## Test environments
-* local OS X install, R 3.3.2
-* ubuntu 12.04 (on travis-ci), R 3.3.2
-* Windows Server 2012 R2 x64 (on appveyor-ci), R 3.3.2
+
+* local OS X install, R 3.4.1
+* ubuntu 12.04 (on travis-ci), R 3.4.1 and devel
+* Windows Server 2012 R2 x64 (on appveyor-ci), R 3.4.1
 * win-builder (devel and release)
 
+
 ## R CMD check results
 
 0 errors | 0 warnings | 0 notes
 
+
 ## Reverse dependencies
 
-There are no reverse dependencies yet.
+We ran R CMD check on all 5 reverse dependencies (summary at
+https://github.com/lionel-/vdiffr/tree/master/revdep). No problems
+were found.
+
+We also run R CMD check for the ggstance package on a Debian system
+featuring FreeType 2.8.0. This new version of vdiffr fixes the
+ggstance failures.