Migrate to bump my version

[protoroto]

Description

• Migrate to bump-my-version
• Fix python/django/djangocms versions in README

References

Fix #176

Checklist

• I have read the contribution guide
• Code lint checked via inv lint
• changes file included (see docs)
• Usage documentation added in case of new features
• Tests added

[coveralls]

coverage: 94.621%. remained the same when pulling f0f7339 on protoroto:feature/issue-176-migrate-to-bump-my-version into 161da94 on nephila:develop.

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (161da94) 91.19% compared to head (f0f7339) 91.19%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #177   +/-   ##
========================================
  Coverage    91.19%   91.19%           
========================================
  Files            9        9           
  Lines          409      409           
  Branches        61       61           
========================================
  Hits           373      373           
  Misses          22       22           
  Partials        14       14           

Flag	Coverage Δ
unittests	91.19% <ø> (ø)

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