chore(ci): back to npm prune instead of lerna clean as travis expects human input even when the --ye
chore(ci): back to npm prune instead of lerna clean as travis expects human input even when the --ye

red6/serenity-js,jan-molak/serenity-js,jan-molak/serenity-js,jan-molak/serenity-js,red6/serenity-js,red6/serenity-js,red6/serenity-js,jan-molak/serenity-js