Update youtube-dl to version 2017.08.18
Update youtube-dl to version 2017.08.18

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