prepare for CRAN release

Author: JohnMount

cran-comments.md

@@ -3,8 +3,8 @@
 
 * using R version 3.4.1 (2017-06-30)
 * using platform: x86_64-apple-darwin15.6.0 (64-bit)
-* win-builder (using R Under development (unstable) (2017-09-12 r73242))
-
+* using R Under development (unstable) (2017-09-12 r73242)
+* using platform: x86_64-w64-mingw32 (64-bit)
 
 ## R CMD check --as-cran vtreat_1.0.0.tar.gz