…g-diff-viewer when the JSON-file is generated on a Puppet Master that has server configuration config_version set to generate Epoch numbers. In this case these numbers where stored as numbers instead of strings in the JSON-file which caused puppet-catalog-diff-viewer to throw an exception when it tries to replace strange characters in the version string. I've verified this works in latest version of puppet-catalog-diff-viewer. See also conversation on #puppet here https://puppetcommunity.slack.com/archives/C0W298S9G/p1594642754396700.

…useful and how it's recommended to be used in a Puppet upgrade.

…rb script should work fine on after discussion with raphink on voxpupuli#30.