Fixed mistyping in readme

readme.md

@@ -69,7 +69,7 @@ http {
     server {
             location /calibre {
                 proxy_bind              $server_addr;
-                proxy_pass              http://127.0.0.1:8080;
+                proxy_pass              http://127.0.0.1:8083;
                 proxy_set_header        Host            $http_host;
                 proxy_set_header        X-Forwarded-For $proxy_add_x_forwarded_for;
                 proxy_set_header        X-Scheme        $scheme;