Update README.md (#970)

There were errors in the examples highlighted, check issue #969

Author: subomi

README.md

@@ -137,7 +137,7 @@ var proxy = httpProxy.createProxyServer({});
 var server = http.createServer(function(req, res) {
   // You can define here your custom logic to handle the request
   // and then proxy the request.
-  proxy.web(req, res, { target: 'http://127.0.0.1:5060' });
+  proxy.web(req, res, { target: 'http://127.0.0.1:5050' });
 });
 
 console.log("listening on port 5050")
@@ -175,7 +175,7 @@ var server = http.createServer(function(req, res) {
   // You can define here your custom logic to handle the request
   // and then proxy the request.
   proxy.web(req, res, {
-    target: 'http://127.0.0.1:5060'
+    target: 'http://127.0.0.1:5050'
   });
 });