Set default_auto_field in AppConfig

[protoroto]

Description

Set default_auto_field in AppConfig to avoid migrations problem if DEFAULT_AUTO_FIELD is different

References

Fix #181

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: 94.634% (+0.01%) from 94.621% when pulling 1014939126e54427dae1b3cca7bbe7dc344a0173 on protoroto:bugfix/issue-181-set-default-auto-field into 43eb9142b4c3d3404920f837eedecbe31e6bb711 on nephila:develop.

[codecov[bot]]

Codecov Report

All modified lines are covered by tests :white_check_mark:

Comparison is base (43eb914) 91.19% compared to head (1014939) 91.21%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #182 +/- ## =========================================== + Coverage 91.19% 91.21% +0.02% =========================================== Files 9 9 Lines 409 410 +1 Branches 61 61 =========================================== + Hits 373 374 +1 Misses 22 22 Partials 14 14 ``` | [Flag](https://app.codecov.io/gh/nephila/djangocms-page-meta/pull/182/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/182/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nephila) | `91.21% <100.00%> (+0.02%)` | :arrow_up: | 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. | [Files](https://app.codecov.io/gh/nephila/djangocms-page-meta/pull/182?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nephila) | Coverage Δ | | |---|---|---| | [djangocms\_page\_meta/apps.py](https://app.codecov.io/gh/nephila/djangocms-page-meta/pull/182?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nephila#diff-ZGphbmdvY21zX3BhZ2VfbWV0YS9hcHBzLnB5) | `100.00% <100.00%> (ø)` | |

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