Add special enum attributes to whitelist.

[eltoder]

Closes #305

• [ ] I have updated the documentation in the README.md file or my changes don't require an update.
• [x] I have added an entry in CHANGELOG.md.
• [ ] I have added or adapted tests to cover my changes.
• [x] I have run tox -e fix-style to format my code and checked the result with tox -e style.

[codecov-commenter]

Codecov Report

Merging #306 (1a1f489) into main (392a742) will increase coverage by 0.00%. The diff coverage is 100.00%.

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@@           Coverage Diff           @@
##             main     #306   +/-   ##
=======================================
  Coverage   98.93%   98.94%           
=======================================
  Files          20       21    +1     
  Lines         660      665    +5     
=======================================
+ Hits          653      658    +5     
  Misses          7        7           

Impacted Files	Coverage Δ
vulture/whitelists/enum_whitelist.py	100.00% <100.00%> (ø)

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[jendrikseipp]

Great, thanks!