Document dependencies

[adamjstewart]

Adding some missing dependencies.

[kthyng]

This looks fine to me!

[adamjstewart]

It looks like the Travis tests are hung. Opening and closing to restart the tests...

[dopplershift]

Travis-CI has recently started limiting resources for open source projects. Matplotlib itself migrated to GitHub Actions, and this repo probably needs to as well.

[adamjstewart]

I would be surprised if this repo exceeded the resource limits, it's not particularly active

[dopplershift]

Well, they're shared across the org...but I guess with matplotlib itself moving, there are now plenty of resources to go around?

[adamjstewart]

Well, Travis finally ran, but it's still erroring out. What do we want to do here?

[adamjstewart]

Can we get this merged?

[kthyng]

I am not clear on protocol. Can I merge this without messing something else up? If so I will do that.

[dopplershift]

@kthyng This repo is independent of the main matplotlib repo, so as the cmocean maintainer, merge whatever you're happy with.

[kthyng]

@dopplershift Ah, sorry for the delay then. I figured someone else was deciding.

[kthyng]

Thanks @adamjstewart!!