Update yaml cpp dependency (#718)
Update yaml cpp dependency (#718)

Full diff: https://github.com/jbeder/yaml-cpp/compare/de8253fcb075c049c4ad1c466c504bf3cf022f45...a6bbe0e50ac4074f0b9b44188c28cf00caf1a723
stratum/stratum,stratum/stratum,stratum/stratum,stratum/stratum,stratum/stratum,stratum/stratum