Update README.md

Author: jdramsey

README.md

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 This package shows how to make arbitrary code in [Tetrad](https://github.com/cmu-phil/tetrad) directly available in Python via [JPype](https://github.com/jpype-project/jpype) as part of a Python workflow. We do this by giving [reusable examples](https://github.com/cmu-phil/py-tetrad/tree/main/pytetrad) of how it can be done, along with [API Javadoc documentation](https://www.phil.cmu.edu/tetrad-javadocs/7.2.2/lib/) to allow further exploration of the entire Tetrad codebase.
 
 Part of our code uses the [causal-learn Python package](https://github.com/py-why/causal-learn) to show how it can be integrated.
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-This replaces the older [py-causal](https://github.com/bd2kccd/py-causal) package.
 
 You can also integrate Tetrad code into Python by making os.system (..) calls to [Causal Command](https://github.com/bd2kccd/causal-cmd); here are some [examples](https://github.com/cmu-phil/algocompy/blob/main/old/causalcmd/tetrad_cmd_algs.py) of how to do it.