Version 2.2.4

This version fixes a bug in UVBeam.efield_to_power that was causing the Conda package builds to fail.

Full changes detailed below:

What's Changed

• Raise clear errors when trying to write metadata only objects to files by @bhazelton in #1072
• Fix conversion of non-crosspol power beams to real by @bhazelton in #1074

Full Changelog: v2.2.3...v2.2.4