Added AUDITLOG_LOGENTRY_MODEL config

[CleitonDeLima]

• Override LogEntry model to get_logentry_model
• Create test model
• CHANGELOG
• Docs guide

[codecov]

Codecov Report

Attention: Patch coverage is 87.80488% with 5 lines in your changes missing coverage. Please review.

Project coverage is 88.36%. Comparing base (5289482) to head (c44a160).
Report is 42 commits behind head on master.

Files with missing lines	Patch %	Lines
auditlog/__init__.py	64.28%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #673      +/-   ##
==========================================
- Coverage   95.21%   88.36%   -6.86%     
==========================================
  Files          31       32       +1     
  Lines        1025     1083      +58     
==========================================
- Hits          976      957      -19     
- Misses         49      126      +77     

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