‘Rosaline’ rewrites ‘Romeo and Juliet’ with an eye on a star-crossed cousin

Tapping into the twin markets of A) lovers of rom-coms and B) recovering English majors, “Rosaline” promotes a fleetingly mentioned “Romeo and Juliet” character front and center, then builds a very clever and breezy movie around her. The result is a welcome starring showcase for Kaitlyn Dever more likely to prosper in the hamlet of Hulu than it would have fared in the province of theaters.