Noted cpython 3.8 bug

[sc336]

PR type: doc improvement

Related issue(s)/PRs

Summary

The bug in cpython3.8 linked above is causing our benchmarking to fail. This isn't really fixable by us, so I've added a warning comment to prevent people banging their heads against this issue.

Fully backwards compatible: yes

PR checklist

• New features: code is well-documented
  • detailed docstrings (API documentation)
  • notebook examples (usage demonstration)
• The bug case / new feature is covered by unit tests
• Code has type annotations
• Build checks
  • I ran the black+isort formatter (make format)
  • I locally tested that the tests pass (make check-all)
• Release management
  • RELEASE.md updated with entry for this change
  • New contributors: I've added myself to CONTRIBUTORS.md

[codecov]

Codecov Report

Base: 98.01% // Head: 98.01% // No change to project coverage 👍

Coverage data is based on head (2deea64) compared to base (abf4289).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #2031   +/-   ##
========================================
  Coverage    98.01%   98.01%           
========================================
  Files           96       96           
  Lines         5401     5401           
========================================
  Hits          5294     5294           
  Misses         107      107           

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[uri-granta]

LGTM!