add CAP LS 302 support and max-lines support for draft/multiline messages

tests/end_to_end/__main__.py

@@ -341,6 +341,8 @@ async def main():
     print("Waiting for irc server to exit…")
     irc.stop()
     await irc.wait()
+    res = await irc.process.stderr.readline()
+    irc_output.write(res.decode())
 
     if failures:
         print("%d test%s failed, please fix %s." % (failures, 's' if failures > 1 else '',