message: Change `Kubeconfig::merge` fn to public.
  make merge fn public
diff: @@ -392,7 +392,7 @@ impl Kubeconfig {
  /// > Example: Preserve the context of the first file to set `current-context`.
  /// > Example: If two files specify a `red-user`, use only values from the first file's `red-user`.
  /// > Even if the second file has non-conflicting entries under `red-user`, discard them.
  - fn merge(mut self, next: Kubeconfig) -> Result<Self, KubeconfigError> {
  + pub fn merge(mut self, next: Kubeconfig) -> Result<Self, KubeconfigError> {
  if self.kind.is_some() && next.kind.is_some() && self.kind != next.kind {
  return Err(KubeconfigError::KindMismatch);
  }
  