Instagram Feed Pro 6.4.1

* Tested with WordPress 5.8 update.
* Fix: PHP error "Uncaught Error: array_merge() does not accept unknown named parameters" when visiting the "About" page using PHP 8+.
* Fix: About page was not recognizing that YouTube Feeds Pro was installed and active when prompting the user to activate a YouTube Feed plugin.
* Fix: Workaround added for some instances of hashtag feeds causing an API error 'API error 1: An unknown error has occurred'.

* Fix: Updated the Instagram authorization URL to prevent issues with connecting personal accounts

* New: Added support for IGTV posts. When creating an IGTV post, keep the "Post a Preview" setting enabled and the IGTV post will appear in your feed. IGTV posts are only available for connected Instagram business profiles and aren't available if you're using a personal Instagram profile in the plugin.
* Fix: Fixed a PHP error when the HTTP request to refresh an access token resulted in an error.