fix typo in test
RT#72882: Avoid warning about "undefined variable in user_agent
RT#72882: Update Changes
Update minimum required version to 5.8.1 in Makefile.PL
Merge branch 'master' of github.com:markstos/CGI.pm
Update Makefile.PL metadata with Github references
version bump and Changelog update for 3.64 release
TAG v3.64