wcs-remove-deprecated-handlers.php

<?php
/**
 * Plugin Name: WooCommerce Subscriptions Remove Deprecation Handlers
 * Plugin URI: https://support.woothemes.com/hc/en-us/articles/205214466
 * Description: Do not load backward compatibility support in Subscriptions 2.0.
 * Author: Prospress Inc.
 * Version: 1.0
 * Author URI: http://prospress.com
 */

function wcs_remove_deprecation_handlers() {
	add_filter( 'woocommerce_subscriptions_load_deprecation_handlers', '__return_false' );
}
add_action( 'plugins_loaded', 'wcs_remove_deprecation_handlers', 0 );