Add 3.11 to test matrix

[tonybaloney]

No description provided.

[codecov-commenter]

Codecov Report

Merging #155 (d024d64) into master (13545cb) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #155   +/-   ##
=======================================
  Coverage   97.36%   97.36%           
=======================================
  Files          23       23           
  Lines        1213     1213           
=======================================
  Hits         1181     1181           
  Misses         32       32           

Impacted Files	Coverage Δ
src/wily/__init__.py	100.00% <100.00%> (ø)

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[cclauss]

https://www.python.org/download/pre-releases

[tonybaloney]

https://www.python.org/download/pre-releases

This should use 3.11b4 (released this week). I want to check it's compatible before RC1 comes out in a month

[cclauss]

It is b4