small readme fix

Author: popenta

README.md

@@ -40,7 +40,7 @@ Allow `pre-commit` to automatically run on `git commit`:
 pre-commit install
 ```
 
-Above, `requirements.txt` should mirror the **dependencies** section of `setup.py`.
+Above, `requirements.txt` should mirror the **dependencies** section of `pyproject.toml`.
 
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