Environment fails at installing decorator: not compatible with Python 2.7

[ilibarra]

During installation I found a conflict with the decorator package version that is installed. Namely, the default version conda installs gets into conflict because it gets in conflict with python 2.7 , a default requirement.

I think this could be solved by downgrading decorator to a 2.6+ compatible version, I found that decorator 4.3.2 is valid based on the current decorator release list.

pip install decorator==4.3.2

Could you update this dependency into the environment.yml file? It could probably ease the installation process.

Thanks for dev and sharing of this repository.