The giveaway just ended,
but the winner already had the base game, which was against of the only requirement I asked in the description:
"
Please, don't enter if you have only the base game. I'll ask for a re-roll if the winner already had the base game. Thanks for understanding."
Because of this, I was forced to ask for a re-roll... :(
I'm waiting for a response from SteamGifts, and a new winner.
EDIT 1: Response from SteamGifts:
Post 1: "Indeed, the winner seems to own the base game so this falls under owning the majority of the pack. Have a nice day, Azrael360."
Post 2: "Automated Message: Request approved."
EDIT 2: I just sent the confirmation e-mail to the new winner...