v0.12.0

What's Changed

• Assert that all defined flags are unique by @ryanfowler in #295
• Add support for formatting MessagePack response bodies by @ryanfowler in #296
• Add support for zstd decompression by @ryanfowler in #297
• Update docs for zstd support by @ryanfowler in #298
• Use a faster gzip implementation during the self-update by @ryanfowler in #299

Full Changelog: v0.11.2...v0.12.0