Changes since version 3.1-dev0 :

Ilia Shipitsin (4):
      CI: use "--no-install-recommends" for apt-get
      CI: switch to lua 5.4
      CI: use USE_PCRE2 instead of USE_PCRE
      CI: VTest: accelerate package install a bit

Tim Duesterhus (2):
      REGTESTS: Remove REQUIRE_VERSION=2.1 from all tests
      REGTESTS: Remove REQUIRE_VERSION=2.2 from all tests

William Lallemand (2):
      DOC: replace the README by a markdown version
      ADMIN: acme.sh: remove the old acme.sh code

Willy Tarreau (3):
      BUG/MINOR: cfgparse: remove the correct option on httpcheck send-state warning
      BUG/MINOR: tcpcheck: report correct error in tcp-check rule parser
      BUG/MINOR: tools: fix possible null-deref in env_expand() on out-of-memory