Major release with fixes on the custom root

What's Changed

• Add support for Python3.11 alpha and upgrade pytest and py by @vinitkumar in #97
• Issue: #99 dicttoxml igores the root param by @psi29a in #100
• fix: we support Python3.7+ now by @vinitkumar in #101

New Contributors

• @psi29a made their first contribution in #100

Full Changelog: v3.9.0...3.10.0