golang-github-naoina-go-stringutil from openSUSE:Leap:15.2 project

需要 standard ，用 root 執行：

zypper addrepo https://download.opensuse.org/repositories/openSUSE:Leap:15.2/standard/openSUSE:Leap:15.2.repo
zypper refresh
zypper install golang-github-naoina-go-stringutil