The preview image of uploaded images now uses the default WordPress image size small, instead of a custom image size. Also these mage previews are now abit smaller because many uploaded images could make the log a bit to long and not so quick to overview.
If a user is running a very old version of WordPress, that is incompatible with Simple History, a message is shown, informing the user that their WordPress is to old.
An error with PHP 7.1 was fixed.
About Simple History
Simple History is an activity feed plugin for WordPress.