WebClient example doesn't work anymore

[ms-afk]

The WebClient example uses a link (http://arduino.cc/asciilogo.txt) which now redirects to its https version. That means the exemple doesn't work anymore, given that it was made to connect to a http server, not a https one.
The old link now shows a text message suggesting to use a new logo (http://arduino.tips/asciilogo.txt) if a http version of the page is needed.
I've opened a pull request to fix this issue: #221