add currency name to currencies.json

[RShergold]

I absolutely love this repo. Thanks for creating it!

The one thing It's missing for me is the name of the currency which I use when the user is selecting their currency from a menu. I've pulled in the names from this gist which is fine but adding it to the repo will make things much cleaner.

Thanks again and keep up the good work!

[smirzaei]

It's a nice thing to have in my opinion. I'll try to add the names to our data from the gist you linked, but if you are in a hurry feel free to send a PR :)

Sorry for the late reply btw