Though Taylor Swift and Beyoncé have long faced rumors of rivalry, recent interactions signal growing bonds between pop music's reigning icons. Swift gleefully attended Beyoncé's December 1st London premiere for new concert film "RENAISSANCE," praising Beyoncé's artistic influence and "generosity of spirit." The supportive appearance follows Swift and Beyoncé exchanging admiration in recent years, like Swift dancing to Beyoncé’s 2016 VMA performance. Past incidents stoked rivalry rumors, from...