use slash syntax instead of old "in"
use slash syntax instead of old "in"

https://github.com/sbt/sbt/pull/6309
takezoe/gitbucket,xuwei-k/gitbucket,gitbucket/gitbucket,xuwei-k/gitbucket,takezoe/gitbucket,takezoe/gitbucket,imeszaros/gitbucket,xuwei-k/gitbucket,imeszaros/gitbucket,imeszaros/gitbucket,gitbucket/gitbucket,takezoe/gitbucket,gitbucket/gitbucket,gitbucket/gitbucket,xuwei-k/gitbucket,imeszaros/gitbucket