discogs_client version check

[ghbrown]

Description

Addresses #4691, providing a warning if the user attempts to use a non-compliant version of discogs_client (any version of the abandoned package discogs-client or python3-discogs-client < 2.3.10). These non-compliant versions give no error when running beet import, but instead manifest as a large number of No matching records found due to rate limiting (which is expected to be implemented by discogs_client).

To Do

• Documentation. (If you've add a new command-line flag, for example, find the appropriate page under docs/ to describe it.)
• Changelog. (Add an entry to docs/changelog.rst near the top of the document.)
• Tests. (Encouraged but not strictly required.)

[JOJ0]

Hi @ghbrown, thank you very much for the PR, this is great! I am only wondering if we should, while we are at it, require an even higher version. I just recalled that we had reports that came out of the beets community about a bytes vs str error around a year ago: joalla/discogs_client#80

It took us a while to fix it but we did in this PR: joalla/discogs_client#94

It was released in 2.3.15: https://github.com/joalla/discogs_client/releases/tag/v2.3.15

[JOJ0]

Looked through release notes and I don't see a reason why 2.3.15 minimum could be problematic.

Also please increase the version requirement of python3-discogs-client in setup.py!

[sampsyo]

Sounds good!!

[ghbrown]

Made the requested changes and also added a minimum version for the extras_require 'test' in setup.py. Not sure why there wasn't one before, but if there's a reason I'm happy to revert.

[sampsyo]

That seems like a very good idea. Thank you!!