Dropping support for old Pythons

[kornicameister]

Description

auth0-python enumerates a lot of Python versions that are quite old.
For instance:

• 2.x - that's coming to its EOL with the end of the year
• up to 3.4 - that's also EOL now

Prerequisites

• I have checked the README documentation.
• I have checked the Auth0 Community for related posts.
• I have checked for related or duplicate Issues and PRs.
• I have read the Auth0 general contribution guidelines.
• I have read the Auth0 Code of Conduct.
• I am reporting this to the correct repository.

Environment

Please provide the following:

• auth0-python==3.9.1
• Python 3.7.x

Reproduction

There are none, I am creating an issue to discuss removing potentially obsolete (or just obsolete) Pythons from the classifiers and adjusting code accordingly. I believe that there are some versions there that are blocking rather interesting initiatives like:

• using typings
• using asyncio ( would be neat TBH )
• many many more, I believe

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. If you have not received a response for our team (apologies for the delay) and this is still a blocker, please reply with additional information or just a ping. Thank you for your contribution! 🙇‍♂️