New: Customers can now opt in/out of your newsletter through the [rcp_profile_editor] shortcode. This is only available if you enable the new "Profile Opt In/Out" setting in Restrict > MailChimp Pro.
Improvement: Set skip_merge_validation API parameter to true when subscribing users. This helps prevent subscription failures if you have custom fields set to required that our add-on doesn't support.
Improvement: Level-specific list settings have been moved to membership level meta (they were previously stored in wp_options).
Improvement: Introduce new wrapper class for the MailChimp API.
Fix: Add capability checks to admin ajax actions.
Fix: E-commerce orders not getting logged after a user changes their email address.
Fix: Escape <optgroup> label with esc_attr() instead of esc_html() when displaying MailChimp groups.
