adding --as-cran to yaml for mac and windows

Author: cmjt

.github/workflows/R-CMD-check.yaml

@@ -45,5 +45,5 @@ jobs:
       - uses: r-lib/actions/check-r-package@v2
         with:
           upload-snapshots: true
-	  args: ' --as-cran'
+	  args: '--as-cran'