TST: use latest pypy37 not pypy36
TST: use latest pypy37 not pypy36

charris/numpy,jakirkham/numpy,pbrod/numpy,mhvk/numpy,endolith/numpy,pbrod/numpy,madphysicist/numpy,mhvk/numpy,anntzer/numpy,pbrod/numpy,seberg/numpy,mattip/numpy,jakirkham/numpy,rgommers/numpy,mattip/numpy,madphysicist/numpy,simongibbons/numpy,jakirkham/numpy,pbrod/numpy,rgommers/numpy,endolith/numpy,anntzer/numpy,pdebuyl/numpy,pdebuyl/numpy,pdebuyl/numpy,charris/numpy,rgommers/numpy,rgommers/numpy,charris/numpy,seberg/numpy,seberg/numpy,simongibbons/numpy,jakirkham/numpy,madphysicist/numpy,endolith/numpy,seberg/numpy,mattip/numpy,anntzer/numpy,numpy/numpy,pdebuyl/numpy,numpy/numpy,madphysicist/numpy,simongibbons/numpy,pbrod/numpy,jakirkham/numpy,endolith/numpy,madphysicist/numpy,mhvk/numpy,mhvk/numpy,charris/numpy,mhvk/numpy,mattip/numpy,anntzer/numpy,numpy/numpy,simongibbons/numpy,numpy/numpy,simongibbons/numpy