remove dependency on chef
remove dependency on chef

you probably have chef if you're installing this, and it's causing
problems installing old versions of chef. we can add it back later if
it's a usability issue

ClogenyTechnologies/knife-windows,namjae/knife-windows,mwrock/knife-windows,MsysTechnologiesllc/knife-windows,MsysTechnologiesllc/knife-windows,RobbertJanSW/knife-windows,chef/knife-windows,namjae/knife-windows,gswallow/knife-windows,schisamo/knife-windows,chef/knife-windows,offslinker/knife-windows,ClogenyTechnologies/knife-windows,RobbertJanSW/knife-windows,offslinker/knife-windows,mwrock/knife-windows