message: make chart version optional
diff: @@ -26,7 +26,7 @@ pub struct ChartConfig {
  #[builder(setter(into))]
  pub location: ChartLocation,
  /// chart version
  - #[builder(setter(into))]
  + #[builder(setter(into), default)]
  pub version: Option<Version>,
  /// set chart name
  @@ -176,3 +176,17 @@ impl ChartInstaller {
  Ok(())
  }
  }
  +
  +#[cfg(test)]
  +mod test {
  +
  + use super::*;
  +
  + #[test]
  + fn test_sys() {
  + let _config: ChartConfig = ChartConfig::sys_builder()
  + .namespace("default")
  + .build()
  + .expect("should build");
  + }
  +}
  