Update kubectl to version 1.8.0
Update kubectl to version 1.8.0

reelsense/scoop,vidarkongsli/scoop,Congee/scoop,kodybrown/scoop,toxeus/scoop,lukesampson/scoop,yunspace/scoop,berwyn/scoop,Cyianor/scoop,nikolasd/scoop,rasa/scoop,coonce/scoop