Added

• .summary() for a short summary to use instead of description when listing subcommands in help (#1726)
• Option.implies() to set other option values when the option is specified (#1724)
• updated Chinese README with 9.x changes (#1727)

Fixed

• TypeScript: add string[] to .options() default value parameter type for use with variadic options (#1721)

Deprecated

• multi-character short option flag (e.g. -ws) (#1718)