Realex: update supported countries list

[slogsdon]

[bpollack]

@slogsdon Would you mind providing a link to the documentation that supports this change?

[slogsdon]

@bpollack Thanks for following up.

I'm not sure if there is a published list of supported countries, but I'll reach out to my teammates at Realex to verify. As a note, this was a story submitted to my team to complete on behalf of Realex (I work for Global Payments, just not for Realex specifically).

[bpollack]

Ah, gotcha. In that case, I can just go ahead and merge.

[bpollack]

@nfarve This one also seems clean to merge; look okay to you?