Bump the required version of pymongo to >=3.5

tests/document/indexes.py

@@ -565,10 +565,6 @@ class IndexesTest(unittest.TestCase):
         self.assertEqual(BlogPost.objects.count(), 10)
         self.assertEqual(BlogPost.objects.hint().count(), 10)
 
-        # PyMongo 3.0 bug only, works correctly with 2.X and 3.0.1+ versions
-        if pymongo.version != '3.0':
-            self.assertEqual(BlogPost.objects.hint([('tags', 1)]).count(), 10)
-
         if MONGO_VER >= MONGODB_32:
             # Mongo32 throws an error if an index exists (i.e `tags` in our case)
             # and you use hint on an index name that does not exist

tests/document/json_serialisation.py

@@ -61,10 +61,6 @@ class TestJson(unittest.TestCase):
         self.assertEqual(doc, Doc.from_json(doc.to_json()))
 
     def test_json_complex(self):
-
-        if pymongo.version_tuple[0] <= 2 and pymongo.version_tuple[1] <= 3:
-            raise SkipTest("Need pymongo 2.4 as has a fix for DBRefs")
-
         class EmbeddedDoc(EmbeddedDocument):
             pass