StateLog.description: use null=True

[blueyed]

This is crucial for migrations, e.g. PostgreSQL < 11.

Fixes https://github.com/gizmag/django-fsm-log/issues/83.

[codecov-io]

Codecov Report

Merging #84 into master will increase coverage by 0.03%. The diff coverage is 100%.

@@            Coverage Diff            @@
##           master     #84      +/-   ##
=========================================
+ Coverage   96.17%   96.2%   +0.03%     
=========================================
  Files          22      23       +1     
  Lines         470     474       +4     
=========================================
+ Hits          452     456       +4     
  Misses         18      18

Impacted Files	Coverage Δ
...go_fsm_log/migrations/0003_statelog_description.py	100% <ø> (ø)	:arrow_up:
django_fsm_log/models.py	100% <100%> (ø)	:arrow_up:
tests/test_model.py	100% <100%> (ø)	:arrow_up:
django_fsm_log/migrations/0005_description_null.py	100% <100%> (ø)

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[blueyed]

Thanks! We should have a new release with this. Will you do it again?

[ticosax]

yes i can.