public String key = "resource=";

    public void VersionChecker(int idOfPlugin, String nameOfPlugin, String versionofPlugin){
        try {
            HttpURLConnection connection = (HttpURLConnection) new URL("https://api.spigotmc.org/legacy/update.php").openConnection();
            connection.setDoOutput(true);
            connection.setRequestMethod("GET");
            connection.getOutputStream().write((idOfPlugin));

            String version = new BufferedReader(new InputStreamReader(connection.getInputStream())).readLine();
            if (!version.equals(versionofPlugin)){
                System.out.println(ChatColor.GOLD + "New version of " + nameOfPlugin + " is available");
            }else{
                System.out.println(ChatColor.GREEN + nameOfPlugin + " is up to date");
            }
        } catch (IOException e) {
            System.out.println(ChatColor.RED + "Unable to chceck the newest version of " + nameOfPlugin);
            e.printStackTrace();
        }
    }