added http-user-agent.php removes blog url from HTTP user agent

see noblogs-composer#26

http-user-agent.php

+<?php
+/*
+ * Plugin Name: A/I - HTTP User Agent
+ * Description: Remove Blog URL from WP_HTTP User Agent
+ * Version: 0.0.1
+ * Author: Autistici/Inventati
+ * Author URI: https://autistici.org
+ */
+
+add_filter('http_headers_useragent', function(){
+    return 'WordPress/' . get_bloginfo( 'version' ) . '; ' . network_home_url();
+});
+
+?>