Taylor Swift revealed very little about her 10th studio album, “Midnights,” before it was released Friday; she didn’t sit for any interviews, and she just gave her usual cryptic hints about what fans could expect. However, in the past few weeks, the pop megastar did post a few short Instagram videos with brief explanations of select songs. One of the songs was “Anti-Hero,” written by Swift and her co-producer and longtime collaborator Jack Antonoff.