What's Changed
- build: pin to v0.1.0 of the multiplexer and remove local pin by @chatton in #4634
- chore: remove antehandlers that do not apply to v4 by @rootulp in #4545
- test: add knuu upgrade test for v3 -> v4 by @chatton in #4589
Full Changelog: multiplexer/v0.1.0...v4.0.0-rc1