Set the timeout to slightly higher than the Twilio timeout

The Twilio API will time out after 30 seconds, this should ensure that clients aren't hanging around for much longer than that.

I haven't tested this as testing is tricky on a Mac but I read the RestSharp docs and it should work.

Ultimately this should be configurable by clients with a default of 3050 but that is probably for the next iteration of the library.