Certain text can force IRC to crash

[emwjacobson]

Twitch-Python/twitch/chat/irc.py

Lines 35 to 37 in 60b52bd

	if text.find('Login authentication failed') > 0:
	logging.fatal('IRC authentication error: ' + text or '')
	return

If a user types "Login authentication failed" in chat, regardless of if the IRC connection has actually failed, it will trigger the fatal logging and return from the active loop.

A suggested fix could be to check to make sure it was not sent via a PRIVMSG

if text.find('Login authentication failed') > 0 and text.find('PRIVMSG') == -1: