[M|0.12.90] Poison ship exploit and typo

[Songleaves]

If you build a room around a poison ship, then it will have no effect outside the room. You can build walls right next to the ship and box it in completely so that it has no effect, or build walls further away from it and create your very own icebox.

Also, during the event notification:

"Several pieces of an ancient ship has crashed nearby."

"has" should be changed to "have"

[Tynan]

Thanks fixed