Upgrade http-proxy to 1.11.1

All xfwd and tests fails with this change, but that's because the
tests themselves were incorrect (using port 80/443 instead of the
ephemeral ports created for the tests).

lib/cors-anywhere.js

@@ -77,11 +77,11 @@ function proxyRequest(req, res, proxy) {
   var location = req.corsAnywhereRequestState.location;
 
   req.url = location.path;
-  // Let the "Host" header be the host part of the path (including port, if specified).
-  req.headers.host = location.host;
 
   // Start proxying the request
   proxy.web(req, res, {
+    changeOrigin: true,
+    prependPath: false,
     target: location
   });
 }