Add a matplotlibrc

[drvinceknight]

EDIT: I have also added some comments to ensure we do not reorder these
imports.

[marcharper]

How does mpl know to look for the rc file there?

[drvinceknight]

How does mpl know to look for the rc file there?

It automatically picks it up from the dir the tests are run from (https://matplotlib.org/users/customizing.html#the-matplotlibrc-file), so this does not change overall behavior of the library but just ensures the correct setting for CI.

From link:

matplotlibrc in the current working directory, usually used for specific customizations that you do not want to apply elsewhere.

[marcharper]

Great, thanks for the explanation.

[marcharper]

should this one occur before import axelrod?

[drvinceknight]

Import orders don't actually matter anymore, the matplotlibrc ooverrides everything but I got myself confused there and will reorder to fit PEP8! (and a bonus rerun of CI to make sure it's still working 🤞)

[marcharper]

If it works then it's fine with me. Might want to put in a comment somewhere that explains what's happening so someone doesn't move things around later, if that still matters with the rc file.

[drvinceknight]

Might want to put in a comment somewhere that explains what's happening so someone doesn't move things around later, if that still matters with the rc file.

The import orders no longer matter (the rc file sets it all) but I'll add a comment to the top of the rc file so we know not to delete it :)