Remove deprecated VERSION, use __version__ instead

[hugovk]

Changes proposed in this pull request:

• Remove VERSION, deprecated added in Reinstate VERSION and deprecate #240.
• Use __version__ instead.

[codecov-commenter]

Codecov Report

Merging #253 (ffe4bcf) into master (309e7fd) will decrease coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #253      +/-   ##
==========================================
- Coverage   97.65%   97.58%   -0.07%     
==========================================
  Files          10        9       -1     
  Lines         681      663      -18     
==========================================
- Hits          665      647      -18     
  Misses         16       16              

Flag	Coverage Δ
GHA_Ubuntu	96.38% <ø> (-0.10%)	⬇️
GHA_Windows	96.07% <ø> (-0.11%)	⬇️
GHA_macOS	96.38% <ø> (-0.10%)	⬇️

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

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