Remove pytest_compat now that the requirement is 3.6+

[blueyed]

No description provided.

[codecov-io]

Codecov Report

Merging #616 into master will increase coverage by 0.08%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #616      +/-   ##
==========================================
+ Coverage   92.19%   92.28%   +0.08%     
==========================================
  Files          33       32       -1     
  Lines        1705     1698       -7     
  Branches      143      142       -1     
==========================================
- Hits         1572     1567       -5     
+ Misses         95       94       -1     
+ Partials       38       37       -1

Flag	Coverage Δ
#dj110	84.33% <100%> (+0.05%)	⬆️
#dj111	86.45% <100%> (+0.06%)	⬆️
#dj18	85.15% <100%> (+0.05%)	⬆️
#dj19	84.21% <100%> (+0.05%)	⬆️
#dj20	84.62% <100%> (+0.05%)	⬆️
#dj21	84.62% <100%> (+0.05%)	⬆️
#djmaster	84.62% <100%> (+0.05%)	⬆️
#mysql_innodb	84.62% <100%> (+0.05%)	⬆️
#mysql_myisam	84.57% <100%> (+0.17%)	⬆️
#postgres	88.04% <100%> (+0.06%)	⬆️
#py27	89.63% <100%> (+0.07%)	⬆️
#py34	84.21% <100%> (+0.05%)	⬆️
#py35	84.33% <100%> (+0.05%)	⬆️
#py36	85.1% <100%> (+0.05%)	⬆️
#sqlite	86.45% <100%> (+0.06%)	⬆️
#sqlite_file	84.21% <100%> (+0.05%)	⬆️

Impacted Files	Coverage Δ
pytest_django/fixtures.py	96.91% <100%> (-0.02%)	⬇️
tests/test_database.py	98.9% <100%> (-0.02%)	⬇️
pytest_django/plugin.py	85.92% <100%> (-0.05%)	⬇️

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