No method "render()" in environment

Hello,

in the examples/demo_FinRL_ElegantRL_China_A_shares.py is StockTradingEnv using. In the line 607 the method env.render() is called, but there is no method named "render()" in this environment. This is why you get an error running this script. Could you please fix or describe, what should be done at this place.

Thank you very much!