restore commented-out tests

Author: n2ygk

tox.ini

@@ -6,10 +6,9 @@ envlist =
 	py37-django{30,22,21},
 	py36-django{22,21},
 	py35-django{22,21},
-# FIXME: something is broken in DRF integration, enable once fixed
-#	py38-djangomaster,
-#	py37-djangomaster,
-#	py36-djangomaster,
+	py38-djangomaster,
+	py37-djangomaster,
+	py36-djangomaster,
 
 [pytest]
 django_find_project = false
@@ -51,6 +50,7 @@ commands =
 deps =
 	flake8
 	flake8-isort
+# TODO: restore this:
 #	flake8-quotes
 
 [coverage:run]