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

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, which also prevents mybinder from successfully building the app.


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

We could/should probably also link to which shares a cool trick to reduce the list of packages in your environment.yml