Port over Changes checks for Travis from libwww-perl config

Author: oalders

dist.ini

@@ -81,6 +81,9 @@ xt_mode = 1
 ; [Test::EOL] ; TODO
 [MetaTests]
 [Test::ChangesHasContent]
+[Substitute]
+file = xt/release/changes_has_content.t
+code = s{^(note 'Checking Changes')}{if \(\(\$ENV\{TRAVIS_PULL_REQUEST\} \|\| '') eq 'false'\) \{\n    chomp\(my \$branch_name = \(\$ENV\{TRAVIS_BRANCH\} || \`git rev-parse --abbrev-ref HEAD\`\)\);\n    \$TODO = 'Changes need not have content for this release yet if this is only the master branch'\n    if \(\$branch_name \|\| ''\) eq 'master';\n\}\n\n$1}
 [Test::MinimumVersion]
 [PodSyntaxTests]