Pebble release v2.2.1. The v2.2.0 release mistakenly tagged the wrong commit. Apologies for the mistake. The v2.2.1 fixes this issue. * separate HTTP management interface/listener. * cert-status-by-serial management endpoint for checking revocation status. * probabilistic valid authorization reuse. * fix missing returns in WFE error paths. * fix WFE rendering of empty contact/authz challenge arrays. * fix custom DNS resolver on Windows. * update docker-compose.yml to use latest image tags. * update docker base images to use Go 1.12. * WFE "marshaling" typo fixes/consistency. Heartfelt thanks to @adferrand, @alexzorin, @eggsampler and @felixfontein for their contributions to this release.