Still being maintained?

Hi Stewart, I really appreciate your efforts in building and maintaining this plugin, it is central to two of my sites. That said, I would like to know if you’re still actively maintaining this plugin?
I see a few support requests that have gone without response now, so it makes me a little concerned.

That said, I do have a couple of minor errors showing up now:

PHP Deprecated: Creation of dynamic property WC_Gateway_Invoice::$instructions is deprecated in /wp-content/plugins/wc-invoice-gateway/includes/class-wc-invoice-gateway.php on line 40

PHP Deprecated: Creation of dynamic property WC_Gateway_Invoice::$order_status is deprecated in /wp-content/plugins/wc-invoice-gateway/includes/class-wc-invoice-gateway.php on line 41

PHP Deprecated: Creation of dynamic property WC_Gateway_Invoice::$user_roles is deprecated in /wc-invoice-gateway/includes/class-wc-invoice-gateway.php on line 42

PHP Deprecated: Creation of dynamic property WC_Gateway_Invoice::$enable_for_methods is deprecated in /wc-invoice-gateway/includes/class-wc-invoice-gateway.php on line 43

PHP Deprecated: Creation of dynamic property WC_Gateway_Invoice::$enable_for_virtual is deprecated in /wc-invoice-gateway/includes/class-wc-invoice-gateway.php on line 44

Your attention is much appreciated. And, I’m also be willing to lend a hand in supporting this plugin if you need it.