DOC: add note of 64-bit wheels on Windows
DOC: add note of 64-bit wheels on Windows

Say that we do provide 64-bit Windows wheels.  Update link to mingwpy.

tacaswell/numpy,mhvk/numpy,simongibbons/numpy,ddasilva/numpy,grlee77/numpy,charris/numpy,ssanderson/numpy,bringingheavendown/numpy,dwillmer/numpy,jakirkham/numpy,anntzer/numpy,pizzathief/numpy,maniteja123/numpy,pbrod/numpy,shoyer/numpy,madphysicist/numpy,endolith/numpy,skwbc/numpy,abalkin/numpy,njase/numpy,AustereCuriosity/numpy,stuarteberg/numpy,anntzer/numpy,bertrand-l/numpy,charris/numpy,pizzathief/numpy,skwbc/numpy,shoyer/numpy,MSeifert04/numpy,seberg/numpy,tynn/numpy,ContinuumIO/numpy,gfyoung/numpy,bertrand-l/numpy,ahaldane/numpy,mhvk/numpy,jakirkham/numpy,Eric89GXL/numpy,charris/numpy,jorisvandenbossche/numpy,behzadnouri/numpy,MSeifert04/numpy,madphysicist/numpy,Eric89GXL/numpy,madphysicist/numpy,AustereCuriosity/numpy,chatcannon/numpy,ddasilva/numpy,utke1/numpy,b-carter/numpy,madphysicist/numpy,gfyoung/numpy,MSeifert04/numpy,pbrod/numpy,behzadnouri/numpy,pbrod/numpy,pdebuyl/numpy,Eric89GXL/numpy,bringingheavendown/numpy,pbrod/numpy,mattip/numpy,numpy/numpy,charris/numpy,ssanderson/numpy,jakirkham/numpy,endolith/numpy,gmcastil/numpy,ahaldane/numpy,shoyer/numpy,WarrenWeckesser/numpy,WarrenWeckesser/numpy,MSeifert04/numpy,numpy/numpy,pbrod/numpy,seberg/numpy,njase/numpy,rgommers/numpy,grlee77/numpy,numpy/numpy,ahaldane/numpy,gfyoung/numpy,mhvk/numpy,seberg/numpy,WarrenWeckesser/numpy,jakirkham/numpy,seberg/numpy,madphysicist/numpy,pdebuyl/numpy,tacaswell/numpy,mattip/numpy,WarrenWeckesser/numpy,kiwifb/numpy,shoyer/numpy,mhvk/numpy,jorisvandenbossche/numpy,bertrand-l/numpy,rgommers/numpy,gmcastil/numpy,tacaswell/numpy,ssanderson/numpy,anntzer/numpy,simongibbons/numpy,utke1/numpy,pdebuyl/numpy,WarrenWeckesser/numpy,mattip/numpy,MSeifert04/numpy,tynn/numpy,jorisvandenbossche/numpy,jakirkham/numpy,pizzathief/numpy,shoyer/numpy,behzadnouri/numpy,ahaldane/numpy,bringingheavendown/numpy,AustereCuriosity/numpy,simongibbons/numpy,pdebuyl/numpy,simongibbons/numpy,ahaldane/numpy,dwillmer/numpy,jorisvandenbossche/numpy,solarjoe/numpy,abalkin/numpy,maniteja123/numpy,utke1/numpy,pizzathief/numpy,njase/numpy,simongibbons/numpy,Eric89GXL/numpy,rgommers/numpy,dwillmer/numpy,grlee77/numpy,stuarteberg/numpy,pizzathief/numpy,jorisvandenbossche/numpy,numpy/numpy,stuarteberg/numpy,mattip/numpy,grlee77/numpy,tynn/numpy,maniteja123/numpy,mhvk/numpy,chatcannon/numpy,anntzer/numpy,endolith/numpy,solarjoe/numpy,b-carter/numpy,ddasilva/numpy,endolith/numpy,rgommers/numpy,grlee77/numpy,kiwifb/numpy,solarjoe/numpy,ContinuumIO/numpy,abalkin/numpy,ContinuumIO/numpy,skwbc/numpy,kiwifb/numpy,dwillmer/numpy,chatcannon/numpy,gmcastil/numpy,b-carter/numpy,stuarteberg/numpy