chore: Revert back to Rails 5.0.0 as default for specs
chore: Revert back to Rails 5.0.0 as default for specs

doorkeeper-gem/doorkeeper-openid_connect,doorkeeper-gem/doorkeeper-openid_connect,doorkeeper-gem/doorkeeper-openid_connect,playon/doorkeeper-openid_connect,playon/doorkeeper-openid_connect,doorkeeper-gem/doorkeeper-openid_connect