This is mostly a maintenance release.
The major version is bumped because of:
- dropped support for PuppetDBs < 5.2.0 (Puppet 4 has reached its end-of-life in October 2018),
- dropped support for Python 3.6 (end-of-life in December 2021).
There might be some performance improvements thanks to the upgrade of the core dependencies - Flask, Jinja2, Werkzeug etc.
Additional improvements:
- Set custom user-agent header that will make troubleshooting easier.