Typo with purchasegift: coasts -> costs

[woctezuma]

After running the following command, I have noticed a typo in English: it should be costs instead of coasts.

Command:

!purchasegift Gifter Recipient

Output:

Purchase done, all coasts: 1,62€

Expected output:

Purchase done, all costs: 1,62€

[chr233]

Thanks for correction