Update testing notes

Author: jon-mago

cran-comments.md

@@ -1,7 +1,7 @@
 ## Test environments
 
 * local Win 10 install, R 3.6.0
-* ubuntu 12.04 (on travis-ci), R 3.6.0
+* ubuntu 14.04 (on travis-ci), R 3.6.0
 * OSX (on travis-ci), R 3.6.0
 * win-builder (release)
 
@@ -12,5 +12,5 @@ There were no ERRORs or WARNINGs or NOTEs.
 
 ## Downstream dependencies
 
-I have also run R CMD check on downstream dependencies of aws.signature.
+I have also run R CMD check on downstream dependencies of aws.ec2metadata.
 All tests pass