Fix flake8 violation.

Author: jcass77

tests/test_connection.py

@@ -147,4 +147,4 @@ def test_connection_kwargs(self):
  self.app.config['TESTING'] = True
  db = MongoEngine()
  db.init_app(self.app)
- self.assertTrue(db.connection.client.codec_options.tz_aware == True)
+ self.assertTrue(db.connection.client.codec_options.tz_aware)