Beyoncé went darker for the launch of her haircare brand, Cécred. See her new lookJulian Dakdouk/Parkwood Media/WireImage Beyoncé celebrates the launch of her hair care line, CÉCRED, with an intimate gathering at Revery LA on Feb. 20 in Los AngelesBeyoncé marked the launch of haircare brand Cécred with a major celebration — and a hair change,…