v0.24.0

A full list of commits for 0.24.0 can be found at:

https://github.com/geopython/OWSLib/commits/0.24.0

• CSW: add CSW 3 client (#746)
• CSW: add support for distributed search (#771)
• OGC API: refactor collections for broader use (#753)
• OACov: add support for scaling (#756)
• Auth: make most Authentication attributes private (#770)
• various bug fixes