Prompt users to remove python.app in environment.yml, a Mac-specific package

Binder
1

For exporting the environment from conda on a MacOs environment, it has been suggested that certain Mac-specific packages be removed from the environment.yml file. An additional package not mentioned is python.app, which also prevents mybinder from successfully building the app.

Source: https://github.com/binder-examples/conda
https://anaconda.org/conda-forge/python.app

2

A PR to update the list of packages would be great.

We could/should probably also link to https://repo2docker.readthedocs.io/en/latest/howto/export_environment.html which shares a cool trick to reduce the list of packages in your environment.yml

3

Done: https://github.com/binder-examples/conda/pull/11