Add NA2 with "chat.na2.lol.riotgames.com" address.

After patch 4.20, "chat.na1.lol.riotgames.com" doesn't work anymore. Changing the address to "chat.na2.lol.riotgames.com" seems to resolves this issue. This is most likely temporary.

See more here:
http://boards.na.leagueoflegends.com/en/c/bug-report/MIcTY11Y-certificate-error-after-420