Add django-upgrade to our pre-commit checks

[codecov[bot]]

Codecov Report

Merging #169 (11715e2) into master (d29ed3f) will increase coverage by 1.83%. The diff coverage is 71.42%.

@@            Coverage Diff             @@
##           master     #169      +/-   ##
==========================================
+ Coverage   95.45%   97.28%   +1.83%     
==========================================
  Files          24       24              
  Lines         528      516      -12     
==========================================
- Hits          504      502       -2     
+ Misses         24       14      -10     

Impacted Files	Coverage Δ
django_fsm_log/backends.py	81.03% <0.00%> (+5.22%)	:arrow_up:
tests/admin.py	100.00% <100.00%> (ø)
tests/test_admin.py	100.00% <100.00%> (+16.66%)	:arrow_up:
tests/urls.py	100.00% <100.00%> (+50.00%)	:arrow_up:

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[ticosax]

I will rebase it after #168