Summarized Changelog:

• Added:
  • Options hotlist_remove_buffer, hotlist_restore_buffer and hotlist_restore_all in command /input
    • Default keys: Alt+h+Alt+m (remove buffer), Alt+h+Alt+r (restore hotlist in current buffer) and Alt+h+Alt+Shift+R (restore hotlist in all buffers)
  • Options -o, -ol, -i and -il in command /plugin list
  • Option -parted in command /allchan
  • Allow signals irc_raw_in and irc_in to eat messages
  • Implement IRCv3.2 SASL authentication
    • Add command /auth
    • Reconnect by default to the server in case of SASL authentication failure
  • Support of capability message-tags and TAGMSG messages
  • Options irc.look.display_account_message and irc.look.display_extended_join
  • Command /setname, add support of message and capability setname
  • Support of FAIL/WARN/NOTE messages
• Removed:
  • Support of DH-BLOWFISH and DH-AES SASL mechanisms
  • Unneeded message about Diffie-Hellman shared secret exchange during SSL connection to server
• Changed:
  • Change key Alt+h to Alt+h+Alt+c
  • Enable all capabilities by default (if supported by server and WeeChat)
  • Default value of option irc.server_default.capabilities is now *
  • Always set realname in nicks even when extended-join capability is not enabled
  • Set notify level to private for received WALLOPS
• Fixed:
  • Decoding of attributes in basic ANSI colors
  • Function string_match with joker in the string if multiple words matched in input string
  • Send of empty JOIN when connecting to a server with only parted channels
  • SASL authentication when AUTHENTICATE message is received with a server name
  • Escape/unescape IRC message tags values

Full changelog available here.

Set up Libera IRC (since I forgot to save it last time...), connect to Libera, send and receive messages on IRC.