chore(deps): update dependency pytest-django to v3.10.0

dev-env-requirements.txt

@@ -2,7 +2,7 @@
 graphene==3.0b7
 graphene-django==3.0.0b7
 pytest==4.6.3
-pytest-django==3.5.0
+pytest-django==3.10.0
 pytest-cov==2.7.1
 flake8==3.7.7
 mock==2.0.0