public String key = "key=98BE0FE67F88AB82B4C197FAF1DC3B69206EFDCC4D3B80FC83A00037510B99B4&resource=";

    public void VersionChecker(int idOfPlugin, String nameOfPlugin, String versionofPlugin){
        try {
            HttpURLConnection connection = (HttpURLConnection) new URL("http://www.spigotmc.org/api/general.php").openConnection();
            connection.setDoOutput(true);
            connection.setRequestMethod("POST");
            connection.getOutputStream().write((key + idOfPlugin).getBytes("UTF-8"));
            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();
        }