Migrate to bump my version

[protoroto]

Description

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

References

Fix #176

Checklist

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

[coveralls]

coverage: 94.621%. remained the same when pulling f0f73391162a873e539032f19875fb9e7e1bb58b on protoroto:feature/issue-176-migrate-to-bump-my-version into 161da9457e3ab46bea7d44979d2a3156b3def206 on nephila:develop.

[codecov[bot]]

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

```diff @@ 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](https://app.codecov.io/gh/nephila/djangocms-page-meta/pull/177/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nephila) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/nephila/djangocms-page-meta/pull/177/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nephila) | `91.19% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nephila#carryforward-flags-in-the-pull-request-comment) to find out more.

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