Support for CHF

[Bce]

Support for top-up and balance in CHF currency.

[robert.dolca]

You can vote here Poll: Which top-up currency should we add next? 📊

[julien]

Hiya! You should check/vote for CHF here:
http://community.revolut.com/t/poll-which-top-up-currency-should-we-add-next/88