No version # on wp_enqueue() function

[SteelWagstaff]

We recently updated to the newest release of this plugin, but ran into some issues caused by users having cached versions of the wp-h5p-xapi.js still loading when they called various pages with H5P activities embedded. It appears that this plugin isn't adding a version to the end of the wp_enqueue() functions, so there is no automatic cache busting of updated scripts/styles (and wp-h5p-xapi.js received an update in the latest release). The enqueue functions in question appear to live here:

wp-h5p-xapi/wp-h5p-xapi.php

Lines 20 to 26 in bdc4cd1

	function h5pxapi_enqueue_scripts()
	{
	wp_register_script("wp-h5p-xapi", plugins_url() . "/wp-h5p-xapi/wp-h5p-xapi.js", array("jquery"));
	wp_enqueue_script("wp-h5p-xapi");
	wp_register_style("wp-h5p-xapi", plugins_url() . "/wp-h5p-xapi/wp-h5p-xapi.css");
	wp_enqueue_style("wp-h5p-xapi");

For ideas about how to implement a fix, see https://wordimpress.com/wordpress-css-and-js-cache-busting/ and https://themetry.com/cache-busting-wordpress/ or https://developer.wordpress.org/reference/functions/wp_enqueue_script/#parameters. I'm not the most skilled developer, but could help with a PR if desired?

[SteelWagstaff]

PR with proposed fix here: #14