message: Derive Clone for RecipientKey
diff: @@ -165,7 +165,7 @@ impl SecretKey {
  }
  /// A key that can be used to encrypt an age message to a recipient.
  -#[derive(Debug)]
  +#[derive(Clone, Debug)]
  pub enum RecipientKey {
  /// An X25519 recipient key.
  X25519(PublicKey),
  