Remove compatibility code for unsupported Django versions

[codecov-commenter]

Codecov Report

Patch coverage: 53.84% and project coverage change: +0.68 :tada:

Comparison is base (9a5a789) 73.34% compared to head (abbdb31) 74.03%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #377 +/- ## ========================================== + Coverage 73.34% 74.03% +0.68% ========================================== Files 124 124 Lines 4277 4232 -45 Branches 527 520 -7 ========================================== - Hits 3137 3133 -4 + Misses 1006 968 -38 + Partials 134 131 -3 ``` | Flag | Coverage Δ | | |---|---|---| | unittests | `74.00% <53.84%> (+0.68%)` | :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=wooey#carryforward-flags-in-the-pull-request-comment) to find out more. | [Impacted Files](https://app.codecov.io/gh/wooey/Wooey/pull/377?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=wooey) | Coverage Δ | | |---|---|---| | [wooey/conf/project\_template/middleware.py](https://app.codecov.io/gh/wooey/Wooey/pull/377?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=wooey#diff-d29vZXkvY29uZi9wcm9qZWN0X3RlbXBsYXRlL21pZGRsZXdhcmUucHk=) | `0.00% <0.00%> (ø)` | | | [...y/conf/project\_template/settings/wooey\_settings.py](https://app.codecov.io/gh/wooey/Wooey/pull/377?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=wooey#diff-d29vZXkvY29uZi9wcm9qZWN0X3RlbXBsYXRlL3NldHRpbmdzL3dvb2V5X3NldHRpbmdzLnB5) | `0.00% <ø> (ø)` | | | [wooey/django\_compat.py](https://app.codecov.io/gh/wooey/Wooey/pull/377?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=wooey#diff-d29vZXkvZGphbmdvX2NvbXBhdC5weQ==) | `100.00% <ø> (ø)` | | | [wooey/views/views.py](https://app.codecov.io/gh/wooey/Wooey/pull/377?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=wooey#diff-d29vZXkvdmlld3Mvdmlld3MucHk=) | `60.46% <0.00%> (+0.12%)` | :arrow_up: | | [wooey/backend/command\_line.py](https://app.codecov.io/gh/wooey/Wooey/pull/377?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=wooey#diff-d29vZXkvYmFja2VuZC9jb21tYW5kX2xpbmUucHk=) | `82.55% <100.00%> (+1.65%)` | :arrow_up: | | [wooey/templatetags/wooey\_tags.py](https://app.codecov.io/gh/wooey/Wooey/pull/377?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=wooey#diff-d29vZXkvdGVtcGxhdGV0YWdzL3dvb2V5X3RhZ3MucHk=) | `71.95% <100.00%> (+20.66%)` | :arrow_up: |

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