Update kubectl to version 1.7.4
Update kubectl to version 1.7.4

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