travis: encrypt irc notification
travis: encrypt irc notification

This prevents forks from sending notifications

abelbriggs1/runelite,abelbriggs1/runelite,runelite/runelite,runelite/runelite,Sethtroll/runelite,l2-/runelite,runelite/runelite,abelbriggs1/runelite,Sethtroll/runelite,l2-/runelite