Remove stale RedisSimpleQueue from __all__

[Master-Norna]

Summary

from pottery import * raises AttributeError on current master:

AttributeError: module 'pottery' has no attribute 'RedisSimpleQueue'

Cause

PR #818 ("Upgrade requirements and remove my idiotic queue") deleted
pottery/queue.py and its import in __init__.py, but left
'RedisSimpleQueue' behind in __all__. A star import resolves every
name in __all__ against the module, so it now fails.

Fix

Remove the stale entry from __all__ (one line).

Verification

• Before: python -c "from pottery import *" -> AttributeError
• After: star import succeeds, pottery.__all__ lists 28 names
• Grepped the whole repo: no remaining references to RedisSimpleQueue
  (including tests)

No behavioral change for any other import path; only the star import,
which was broken, is fixed.

[Master-Norna]

Hi @brainix — this is a one-line cleanup: #818 removed pottery/queue.py but left 'RedisSimpleQueue' in __all__, which makes from pottery import * raise AttributeError. Verified locally: the star import works after the change, and no other references to the name remain in the repo.

The CI run is currently pending approval for first-time contributors — could you approve it so the checks can run? Thanks!

[brainix]

Thank you for the contribution!