add test note

Author: JohnMount

cran-comments.md

@@ -7,6 +7,8 @@
   * using platform: x86_64-apple-darwin15.6.0 (64-bit)
 
   * win-builder 
+  * using R version 3.5.0 beta (2018-04-08 r74552)
+  * using platform: x86_64-w64-mingw32 (64-bit)
 
 ## R CMD check --as-cran cdata_0.7.0.tar.gz