Instagram Feed Pro 6.4

* Fix: Added a content type to JSON responses to improve reliability for loading more posts and creating local images.
* Fix: The plugin will no longer continue to attempt to connect to the Instagram API if there is an access token encryption error.
* Fix: Could not load more posts when using moderation mode.
* Fix: Fixed a PHP error that would occur when trying to retrieve new posts for hashtag feeds.

* Tweak: Added a warning if the access token could not be decrypted for use in API requests.
* Tweak: Added a fallback method to reach the Instagram API if a cURL error 6 error is detected.
* Fix: Fixed an issue with connecting an additional business account if the first account listed was not selected.

* Tweak: Shortened captions will end on the last full word to fix an issue with emoji in captions.
* Fix: Fixed several accessibility issues in the admin area.
* Fix: Made a significant number of code quality improvements.
* Fix: Fixed a PHP warning that would occur when loading posts with AJAX initially.
* Fix: Periods and underscores in usernames when used as part of the shortcode would cause the load more button not to work.