v0.12.0

What's Changed

• Open the next snapshot line by @github-actions[bot] in #82
• Bump sbt-zipx to 0.19.1 and sbt to 2.1.0-RC1 by @russwyte in #85
• Pin docs to specular 0.21.0. by @russwyte in #83
• Keep a handler's 404 when another route is composed by @russwyte in #86
• Read and write typed headers on an endpoint by @russwyte in #87
• ci: zipx version updates by @early-effect-zipx[bot] in #88

Full Changelog: v0.11.0...v0.12.0