v0.5.0

Major refactor.

• Drops Stokes combination
• Uses large file initialisation for memory reduction
• Uses asyncio for speed
• Primary API now just returns frequencies (no HDUlist)

What's Changed

• Use file initialisation by @AlecThomson in #14

New Contributors

• @dependabot made their first contribution in #6

Full Changelog: v0.4.3...v0.5.0