chore(package): update yargs to version 6.6.0 (#1097)
chore(package): update yargs to version 6.6.0 (#1097)

https://greenkeeper.io/
aabustamante/Semantic-UI-React,aabustamante/Semantic-UI-React,Rohanhacker/Semantic-UI-React,clemensw/stardust,aabustamante/Semantic-UI-React,vageeshb/Semantic-UI-React,Rohanhacker/Semantic-UI-React,koenvg/Semantic-UI-React,Semantic-Org/Semantic-UI-React,koenvg/Semantic-UI-React,vageeshb/Semantic-UI-React,mohammed88/Semantic-UI-React,Semantic-Org/Semantic-UI-React,clemensw/stardust,mohammed88/Semantic-UI-React