Update cran comments for release.

Author: dmurdoch

cran-comments.md

@@ -1,6 +1,8 @@
 ## parseLatex 0.4.4
 
 * This revision is mainly at the request of CRAN, to fix
-issues detected by rchk and a new gcc compiler.
-* It also makes \let and \def syntax a bit more 
-flexible.
+issues detected by rchk and a new gcc compiler.  
+* There are still some rchk false positives, since the parser
+makes use of Tomas Kalibera's PRESERVE_SV macro, and it isn't
+recognized by rchk.
+* It also makes \let and \def syntax a bit more flexible.