remove obsolete django.VERSION < (1, 10) code

[jedie]

No description provided.

[coveralls]

Coverage increased (+0.3%) to 90.956% when pulling 3d8908e on cleanup into 6887008 on master.

[coveralls]

Coverage increased (+0.3%) to 90.956% when pulling 3d8908e on cleanup into 6887008 on master.

[codecov]

Codecov Report

Merging #128 into master will increase coverage by 0.48%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #128      +/-   ##
==========================================
+ Coverage   87.57%   88.06%   +0.48%     
==========================================
  Files          28       28              
  Lines        1409     1399      -10     
  Branches      145      141       -4     
==========================================
- Hits         1234     1232       -2     
+ Misses        131      125       -6     
+ Partials       44       42       -2     

Impacted Files	Coverage Δ
reversion_compare/mixins.py	79.48% <100.00%> (+3.68%)	⬆️
reversion_compare_tests/utils/test_cases.py	85.71% <100.00%> (+3.49%)	⬆️

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