Advertize standard-replies capability

Not much point as we send standard replies unconditionally, but there's no
harm in advertizing it anyway

Author: progval

lib/irc/handler.ex

@@ -78,6 +78,9 @@ defmodule M51.IrcConn.Handler do
     # https://ircv3.net/specs/extensions/server-time
     "server-time" => {:server_time, nil},
 
+    # https://ircv3.net/specs/extensions/standard-replies
+    "standard-replies" => {:standard_replies, nil},
+
     # https://ircv3.net/specs/extensions/userhost-in-names
     # not really useful; but kiwiirc/irc-framework interprets "foo:example.org"
     # as {nick: '', user: '', hostname: 'foo:example.org'} without this,

test/irc/handler_test.exs

@@ -18,8 +18,8 @@ defmodule M51.IrcConn.HandlerTest do
   use ExUnit.Case, async: false
   doctest M51.IrcConn.Handler
 
-  @cap_ls_302 ":server. CAP * LS :account-tag batch draft/account-registration=before-connect draft/channel-rename draft/chathistory draft/multiline=max-bytes=8192 echo-message extended-join labeled-response message-tags sasl=PLAIN server-time soju.im/account-required userhost-in-names\r\n"
-  @cap_ls ":server. CAP * LS :account-tag batch draft/account-registration draft/channel-rename draft/chathistory draft/multiline echo-message extended-join labeled-response message-tags sasl server-time soju.im/account-required userhost-in-names\r\n"
+  @cap_ls_302 ":server. CAP * LS :account-tag batch draft/account-registration=before-connect draft/channel-rename draft/chathistory draft/multiline=max-bytes=8192 echo-message extended-join labeled-response message-tags sasl=PLAIN server-time soju.im/account-required standard-replies userhost-in-names\r\n"
+  @cap_ls ":server. CAP * LS :account-tag batch draft/account-registration draft/channel-rename draft/chathistory draft/multiline echo-message extended-join labeled-response message-tags sasl server-time soju.im/account-required standard-replies userhost-in-names\r\n"
   @isupport "CASEMAPPING=rfc3454 CLIENTTAGDENY=*,-draft/react,-draft/reply CHANLIMIT= CHANTYPES=#! CHATHISTORY=1000 MAXTARGETS=1 MSGREFTYPES=msgid PREFIX= TARGMAX=JOIN:1,PART:1 UTF8ONLY :are supported by this server\r\n"
 
   setup do