Normalize package name to lower-case in setup.py

[akx]

Fixes #1109.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.21%. Comparing base (a32f15e) to head (21f38b5).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1110   +/-   ##
=======================================
  Coverage   91.21%   91.21%           
=======================================
  Files          27       27           
  Lines        4496     4496           
=======================================
  Hits         4101     4101           
  Misses        395      395           

Flag	Coverage Δ
macos-12-3.10	89.99% <ø> (ø)
macos-12-3.11	89.99% <ø> (ø)
macos-12-3.12	90.16% <ø> (ø)
macos-12-3.13-dev	89.67% <ø> (ø)
macos-12-3.8	89.91% <ø> (ø)
macos-12-3.9	89.91% <ø> (ø)
macos-12-pypy3.10	89.99% <ø> (ø)
ubuntu-22.04-3.10	90.01% <ø> (ø)
ubuntu-22.04-3.11	90.01% <ø> (ø)
ubuntu-22.04-3.12	90.19% <ø> (ø)
ubuntu-22.04-3.13-dev	89.70% <ø> (ø)
ubuntu-22.04-3.8	89.93% <ø> (ø)
ubuntu-22.04-3.9	89.93% <ø> (ø)
ubuntu-22.04-pypy3.10	90.01% <ø> (ø)
windows-2022-3.10	90.13% <ø> (ø)
windows-2022-3.11	90.13% <ø> (ø)
windows-2022-3.12	90.31% <ø> (ø)
windows-2022-3.13-dev	89.82% <ø> (ø)
windows-2022-3.8	90.06% <ø> (ø)
windows-2022-3.9	90.06% <ø> (ø)
windows-2022-pypy3.10	90.13% <ø> (ø)

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