bumping summingbird version to 0.5.2rc5
bumping summingbird version to 0.5.2rc5

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