Updated CRAN comments

Author: chriscarrollsmith

cran-comments.md

@@ -1,3 +1,12 @@
 ## R CMD check results
 
 0 errors | 0 warnings | 0 notes
+
+### CRAN comments
+
+>It seems we need to remind you of the CRAN policy:
+>
+>'Packages which use Internet resources should fail gracefully with an informative message
+>if the resource is not available or has changed (and not give a check warning nor error).'
+
+Fixed; the test in question now uses a mock for the invalid URL rather than actually trying to access it.