WordPress-ActivityPub 3.1.0 Released

What's Changed

• Add line brakes to user biography by @danielhuesken in #829
• Changed missing activitypub_user_description to activitypub_description by @danielhuesken in #830
• Fix undefined get_sample_permalink by @mattwiebe in #832
• Only send Update for previously-published posts by @mattwiebe in #833
• Add ordering for Extra fields by @danielhuesken in #827