rubygem-websocket-driver-0_6 from openSUSE:Leap:15.0 project

需要 standard ，用 root 執行：

zypper addrepo https://download.opensuse.org/repositories/openSUSE:Leap:15.0/standard/openSUSE:Leap:15.0.repo
zypper refresh
zypper install rubygem-websocket-driver-0_6