Stop using assertEqual use assert instead (#382)

Author: asherf

django_prometheus/tests/end2end/testapp/test_migrations.py

@@ -24,7 +24,7 @@ def test_counters(self):
         executor.migration_plan.return_value = set()
         executor.loader.applied_migrations = {"a", "b", "c"}
         ExportMigrationsForDatabase("fakedb1", executor)
-        self.assertEqual(executor.migration_plan.call_count, 1)
+        assert executor.migration_plan.call_count == 1
         executor.migration_plan = MagicMock()
         executor.migration_plan.return_value = {"a"}
         executor.loader.applied_migrations = {"b", "c"}