Minions expected to drive summer box-office win for ‘Despicable Me 3’ as other franchises falter

LOS ANGELES — Film franchises are having a chilly summer at the box office. “Transformers: The Last Knight” stalled out, “The Mummy” got buried, and “Alien: Covenant” drifted off into space. Now it’s up to the yellow Minions of “Despicable Me 3” to help cure the malaise. The cartoon comedy is expected to gross $90 million…