The May 19 season finale of Saturday Night Live, with host Tina Fey and musical guest Nicki Minaj, averaged a 4.5 Live+Same day household rating in the metered markets and a 1.9 adults 18-49 rating in the markets with local people meters. That was up notch from last week’s episode hosted by Amy Schumer (4.3, 1.8) and SNL‘s best overnights since the April 7 telecast, with host Chadwick Boseman and musical guest Cardi B (4.6, 2.0). Still, last night’s show, which included…