You can clone with
HTTPS or Subversion.
I get the warning "You are using Excon 0.25.3. WebMock supports version >= 0.27.5.".
In the gemspec the version specified is ">= 0.22.0", but in excon_adapter.rb you check for '0.27.5'.
Thanks for reporting that. Excon changes too fast :)
If you have to use 0.25.3, WebMock 1.14 is compatible with it.
I also noticed this today. Can you update the gemspec?
Bump minimal version of excon to 0.27.5