Changed "it's" to "its"

[jnmimartin]

I'm new here, and it's my first time using Github. I'm trying to get involved in the game from a writer and editor's perspective, and I saw the wrong "it's" in the README, which I was just trying to change to "its" as a learning opportunity. Forgive me if I've messed something up or issued something twice.
John

[Jared-Sprague]

@jnmimartin Thank you so much! We really could use your writing and editing skills when we get into writing object descriptions for the game. Every object will need one!