upgrade scalacheck
upgrade scalacheck

joychugh/summingbird,nkhuyu/summingbird,twitter/summingbird,nkhuyu/summingbird,rangadi/summingbird,atomicjets/summingbird,nvoron23/summingbird,rangadi/summingbird,joychugh/summingbird,nvoron23/summingbird,twitter/summingbird,atomicjets/summingbird