Propose the hooks upstream

[Pedro Algarvio]

Has an attempt to add in the required hooks made to the upstream marshmallow project?

The reason I ask this is because if one tries to install a marshmallow plugin, say, marshmallow-jsonschema, it has marshmallow listed as its dependency and will pull that in when installing.
We're then left with an unpredictable situation on which marshmallow library will python import.
If we uninstall it afterward, we end up with something like:

pkg_resources.DistributionNotFound: The 'marshmallow>=2.9.0' distribution was not found and is required by marshmallow-jsonschema

[Rafal Stozek]

I believe this is already done: marshmallow-code/marshmallow#629

[Pedro Algarvio]

Thanks, following the issue upstream.