Updated Vircurex Uri

Looks like the Uri has been changed. As Per the Vircurex docs:

The server name for API calls is https://api.vircurex.com.
Please do not make API calls against https://vircurex.com, this will be discontinued from February 2014 onwards.

https://vircurex.com/welcome/api?locale=en
Merge pull request #314 from dhenry/patch-1

Updated Vircurex Uri