v2.3.8

What's Changed

• add optional to generated proto file by @wubin1989 in #210
• add optional to generated proto file by @wubin1989 in #211
• ... by @wubin1989 in #212
• v2.3.8 by @wubin1989 in #219

Full Changelog: v2.3.7...v2.3.8