Dependency Handling

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Description

After reading this blog post, I'm convinced that we should not be using upper bound constraints for our dependencies.

tl;dr It is much more of a headache for users if libraries add upper version constraints. The author gives in depth reasons and suggested ways to avoid upper version constraints.

Proposal

• Remove all upper version constraints (< and ~).
• Add a job that installs with --pre and runs our tests
• Do not merge a PR that causes the --pre job to fail
• Try not to release with a failing --pre job
• Add config to run pytest with filterwarnings=error
• Add a cron config to our workflows to make sure they run nightly