Discourage wordpress plugin updates

function.no-plugin-updates.php

<?php
// Add this to your functions.php
// Discourage wordpress plugin updates
function no_plugin_updates($value) {
  unset($value->response[ plugin_basename('pluginfolder/pluginfile.php') ]);
  return $value;
}
add_filter('site_transient_update_plugins', 'no_plugin_updates');