Document how to install with older versions of macOS (issues with pyproj wheels)

[adamltyson]

movement relies on pyproj which only has ARM wheels for macOS 14: https://pypi.org/project/pyproj/#files

On my system (macOS 13), movement fails to install with pip, but works with conda. I don't think there's much to be done here (other than keeping my OS up to date). However, it may be worth documenting that users in this siutation should install via conda.

[adamltyson]

Can confirm movement installs just fine with pip on macOS 15.3.1 after an update.

[niksirbi]

Thanks for reporting. We could either add a note about this to the installation guide, or do nothing (and hope that people who run into this problem discover this issue). It's one more of those problems that will go away with time.

Any preference?

[adamltyson]

IMO, a note should be added. While the problem will improve over time, I would like the think I'm not the most tech illiterate person, so there will be other people in a similar position. It's also not a trivial issue to diagnose.