WooCommerce Downloadable Product Update E-mails 2.0.10

- [Fix] Plugin would not work on WordPress versions lower than 5.5 because of undefined wp_get_environment_type() function error.

- [New] {product_table} magic tag; output a product table within your update email. Learn More: Available Magic Tags - WooCommerce Downloadable Product Update Emails
- [Fix] {what_changed} magic tag did not work for variable products.
- [Info] Tested on WP 5.8
- [Info] Tested on WC 5.6

- [New] What Changed textarea added to the Product Update metabox. Let customers know what changed in your latest update.
- [Info] Tested on WC 5.4