Version 1.5.0

Various updates around Facebook engagement.

Changelog

• added: Added option to sort by fb_total_engagement in POST /v1/articles
• improved: Restricted option to sort by fb_likes, fb_shares, fb_comments, fb_loves, fb_wows, fb_hahas, fb_sads, fb_angrys only for content_type fb_posts in POST /v1/articles
• broken: Removed fb_likes, fb_shares, fb_comments from sort_by in POST /v1/stats