WordPress 4.6 breaks Tweetily

After upgrading to WordPress 4.6, the following error message appears at the top of all pages (frontend and backend):

Strict Standards: Only variables should be passed by reference in /home/user/public_html/website/wp-content/plugins/tweetily-tweet-wordpress-posts-automatically/top-admin.php on line 888

https://wordpress.org/plugins/tweetily-tweet-wordpress-posts-automatically/