Can somone provide a working environment.yml for this notebook?

RE: `You do not need to install anything! You should be able to run all code from our released colab.`
This was not my experience.

I've been at this for about a week now, and the Jupyter colab seems to requires dozens of packages that don't play nicely together, and I am not able to get very far with it due to tensorflow chicken & egg incompatibilties with all of the random packages that are required.

For anyone who sees this -- if this book is working in your environment -- can you just run a quick
`conda env export --file environment.yml` and share the file it produces?

Thanks!