Switch to assertEqual

Author: jchen9

contrib/opentimelineio_contrib/adapters/tests/test_aaf_adapter.py

@@ -1155,7 +1155,7 @@ def test_aaf_marker_over_audio_file(self):
         self.assertTrue(1 == len(timeline.tracks))
 
         track = timeline.tracks[0]
-        self.assertTrue(3 == len(track.markers))
+        self.assertEqual(3, len(track.markers))
 
         fps = 24.0
         expected_markers = [