CI: pin numpy to 1.19.5 on Appveyor
CI: pin numpy to 1.19.5 on Appveyor

vigna/scipy,Stefan-Endres/scipy,vigna/scipy,endolith/scipy,e-q/scipy,mdhaber/scipy,ilayn/scipy,rgommers/scipy,scipy/scipy,anntzer/scipy,matthew-brett/scipy,rgommers/scipy,endolith/scipy,vigna/scipy,ilayn/scipy,anntzer/scipy,mdhaber/scipy,andyfaff/scipy,perimosocordiae/scipy,anntzer/scipy,andyfaff/scipy,ilayn/scipy,endolith/scipy,tylerjereddy/scipy,matthew-brett/scipy,andyfaff/scipy,ilayn/scipy,andyfaff/scipy,Stefan-Endres/scipy,matthew-brett/scipy,zerothi/scipy,Eric89GXL/scipy,Stefan-Endres/scipy,zerothi/scipy,perimosocordiae/scipy,WarrenWeckesser/scipy,Stefan-Endres/scipy,scipy/scipy,Stefan-Endres/scipy,perimosocordiae/scipy,tylerjereddy/scipy,mdhaber/scipy,rgommers/scipy,grlee77/scipy,mdhaber/scipy,ilayn/scipy,Eric89GXL/scipy,anntzer/scipy,endolith/scipy,tylerjereddy/scipy,ilayn/scipy,endolith/scipy,grlee77/scipy,Eric89GXL/scipy,anntzer/scipy,Eric89GXL/scipy,Stefan-Endres/scipy,vigna/scipy,matthew-brett/scipy,perimosocordiae/scipy,Eric89GXL/scipy,WarrenWeckesser/scipy,perimosocordiae/scipy,vigna/scipy,perimosocordiae/scipy,grlee77/scipy,e-q/scipy,tylerjereddy/scipy,grlee77/scipy,rgommers/scipy,andyfaff/scipy,scipy/scipy,grlee77/scipy,anntzer/scipy,scipy/scipy,WarrenWeckesser/scipy,andyfaff/scipy,tylerjereddy/scipy,e-q/scipy,mdhaber/scipy,mdhaber/scipy,scipy/scipy,e-q/scipy,Eric89GXL/scipy,zerothi/scipy,WarrenWeckesser/scipy,zerothi/scipy,matthew-brett/scipy,WarrenWeckesser/scipy,scipy/scipy,zerothi/scipy,zerothi/scipy,WarrenWeckesser/scipy,rgommers/scipy,e-q/scipy,endolith/scipy