v9.1.0

What's Changed

• Deprecated: options such as filter that that previously supported set types now expect Sequence types such as list or tuple. Support for set will be removed in v10.
• Dropped build support for old operating systems that reached end-of-life
• Disable x86, armv7, s390x, ppc64le manylinux pip builds (breaking due to deflate dependency)
• Update to oxipng 9.1
• Update build toolchain
• Refactor internals

Full Changelog: v9.0.1...v9.1.0