Add support of WebMock's `stub_http_request#to_timeout`
And fix and spec
#to_raise while we're here
> p response.to_s "/home/ojab/src/httpx/lib/httpx/response.rb:319:in `full_message': \e[1mTimed out (\e[1;4mHTTPX::TimeoutError\e[m\e[1m)\e[m\n"
(it's unexpected to have escape sequences) and
response.read doesn't exist, so recommended way to work with responses leads to specialcases for errors, not really handy. I'm going to create two issues about it in the coming days, just letting you know here.