Fix MYINFO response

Respond to MYINFO with four distinct parameters, not one with all
parameters concatenated.

This was breaking Huggle, per phab:T378667, also see
huggle/huggle3-qt-lx#375. It was worked around since, but this was an
ircstream bug that had to be fixed anyway.

ircstream/ircserver.py

@@ -562,7 +562,7 @@ async def end_registration(self) -> None:
         await self.msg(RPL.WELCOME, "Welcome to IRCStream")
         await self.msg(RPL.YOURHOST, f"Your host is {self.server.servername}, running version {__version__}")
         await self.msg(RPL.CREATED, f"This server was created {self.server.boot_time:%c} UTC")
-        await self.msg(RPL.MYINFO, f"{self.server.servername} {__version__} i {''.join(cmodes)}")
+        await self.msg(RPL.MYINFO, [self.server.servername, __version__, "i", "".join(cmodes)])
         await self.msg(
             RPL.ISUPPORT,
             [