Revert "Set ruby version"
Revert "Set ruby version"

This reverts commit f7ae43ae2b95a3ff22db0fd23f9549725ec49139.

adambutler/poll,maripiyoko/poll,lefred/poll,lefred/poll,adambutler/poll,lefred/poll,maripiyoko/poll,adambutler/poll,maripiyoko/poll