add sponsorship link and update postbin link to requestbin

httpbin/templates/httpbin.1.html

@@ -3,7 +3,7 @@
 <p>Freely hosted in <a href="http://httpbin.org">HTTP</a>,
 <a href="https://httpbin.org">HTTPS</a> &amp;
 <a href="http://eu.httpbin.org">EU</a>
-flavors.</p>
+flavors. Sponsored by <a href="https://www.runscope.com">Runscope</a>.</p>
 
 <h2 id="ENDPOINTS">ENDPOINTS</h2>
 
@@ -37,7 +37,7 @@ flavors.</p>
 
 <h2 id="DESCRIPTION">DESCRIPTION</h2>
 
-<p>Testing an HTTP Library can become difficult sometimes. PostBin.org is fantastic
+<p>Testing an HTTP Library can become difficult sometimes. <a href="http://requestb.in">RequestBin</a> is fantastic
 for testing POST requests, but not much else. This exists to cover all kinds of HTTP
 scenarios. Additional endpoints are being considered (e.g. <code>/deflate</code>).</p>