remove setup.py reference in postbuild

postBuild

@@ -1,6 +1,6 @@
 #!/bin/bash
 # This file is used by Binder to install this repo into the binder environment
 #    https://mybinder.readthedocs.io/en/latest/using/config_files.html#postbuild-run-code-after-installing-the-environment
-# Notably, providing an environment.yml file means pip files (requirements.txt and setup.py) are ignored
+# Notably, providing an environment.yml file means pip files (requirements.txt and pyproject.toml) are ignored
 
 python -m pip install -e .[develop]