Bump WooCommerce tested with version, look into early alerting

[nickcernis]

The WooCommerce status page at wp-admin/admin.php?page=wc-status warns:

Genesis Connect for WooCommerce by StudioPress – 1.0 – Not tested with the active version of WooCommerce.

Site owners get confused and frustrated when our tested with version doesn't match the latest WooCommerce: https://wordpress.org/support/topic/woocommerce-3-5-update/#post-10839561

We should look at ways to keep the 'tested with' version in better sync with WooCommerce and WordPress for this and other SP plugins.