Wrong `__version__` in `__init__.py`

[SkirOwen]

Hi,

I've noticed the wrong version number set for __version__ in __init.py__.

One solution would be to use importlib.metadata.version('cmocean') to always the correct version number taken from the setup.py.

If that is something wanted, I am happy to do a PR for it :)

[kthyng]

I'd appreciate your help on this, but what I would prefer is for the version to update itself. The reason the version on this is always messed is because I built this before I learned more about packaging myself and it is cobbled together from several people's work, and probably not consistent. But also because in my other packages I have github releases determine the version and it is passed on down from there. Every time I do a release here I have forgotten to update the file and then I have to release again after I update it and apparently I still did it wrong if you found an error!

[MatthewFlamm]

I had these problems with my packages before when trying to manually update versioning. I switched to using setuptools-scm, and it makes things way easier in terms of maintenance. matplotlib itself is, in part, using this package. It is more complex there with meson-python in addition. See https://github.com/matplotlib/matplotlib/blob/029b026afe65da32f406af618dc3dd209f40120a/pyproject.toml#L93-L97

[QuLogic]

Probably would be fixed by #111, as it adds setuptools-scm.