Fix migrations, update testing matrix

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (f09aa96) 92.42% compared to head (aacf057) 92.43%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #83 +/- ## ======================================= Coverage 92.42% 92.43% ======================================= Files 57 57 Lines 3500 3502 +2 Branches 191 223 +32 ======================================= + Hits 3235 3237 +2 Misses 223 223 Partials 42 42 ``` | [Impacted Files](https://codecov.io/gh/adamcharnock/django-hordak/pull/83?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Adam+Charnock) | Coverage Δ | | |---|---|---| | [hordak/resources.py](https://codecov.io/gh/adamcharnock/django-hordak/pull/83?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Adam+Charnock#diff-aG9yZGFrL3Jlc291cmNlcy5weQ==) | `100.00% <100.00%> (ø)` | | | [hordak/tests/test\_resources.py](https://codecov.io/gh/adamcharnock/django-hordak/pull/83?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Adam+Charnock#diff-aG9yZGFrL3Rlc3RzL3Rlc3RfcmVzb3VyY2VzLnB5) | `100.00% <100.00%> (ø)` | | | [hordak/tests/views/test\_transactions.py](https://codecov.io/gh/adamcharnock/django-hordak/pull/83?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Adam+Charnock#diff-aG9yZGFrL3Rlc3RzL3ZpZXdzL3Rlc3RfdHJhbnNhY3Rpb25zLnB5) | `92.59% <100.00%> (+0.07%)` | :arrow_up: |

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