Changelog Details
* Fix: Make sure we are not calling functions statically in main class.
* Fix: Remove opening hours meta post from post type schema.
* Fix: Possible bug in schema properties fields.
* Fix: Error on AMP markup output for special pages (contact and about pages).
* Fix: Not able to override author name by mapping property field value.
* Fix: PHP warning in post type list class in locations target column.
* Enhancement: Added check and display notice if ACF or ACF PRO is active.
* Enhancement: Added gtin8, gtin12, gtin13, gtin14, and mpn properties to Product markup.
* Enhancement: Added new features and settings for breadcrumbs markup.
* Enhancement: Added new function schema_premium_rating_star to be used by extensions.
* Enhancement: Display message on new post creation, when post id is not available yet.
* Enhancement: Display message when property fields are not set to new custom field.
* Enhancement: Added new function is_edit_page to check if it is an edit page.
* Enhancement: Load properties fields in wp instead of acf/init on non admin pages.
* Update: Drop support for Google+ since Google is dropping it.
* Update: Pumped tested WordPress version to 5.1.1 release.
* Tweak: Set alternativeHeadline property field to disabled.
* Tweak: Added more description for Default Image setting.
* Tweak: Changed order of Schemas sub setting, put author before breadcrumbs.
"Schema Premium"