message: Ensure Encryptor implements trait Send
  By adding the Send trait as a requirement to the recipients vec, we
  gain the Send trait on Encryptor. This is useful for other async
  frameworks that require Send across await's.
diff: @@ -50,7 +50,7 @@ impl Nonce {
  /// Handles the various types of age encryption.
  enum EncryptorType {
  /// Encryption to a list of recipients identified by keys.
  - Keys(Vec<Box<dyn Recipient>>),
  + Keys(Vec<Box<dyn Recipient + Send>>),
  /// Encryption to a passphrase.
  Passphrase(SecretString),
  }
  @@ -63,7 +63,7 @@ impl Encryptor {
  /// recipients.
  ///
  /// Returns `None` if no recipients were provided.
  - pub fn with_recipients(recipients: Vec<Box<dyn Recipient>>) -> Option<Self> {
  + pub fn with_recipients(recipients: Vec<Box<dyn Recipient + Send>>) -> Option<Self> {
  (!recipients.is_empty()).then(|| Encryptor(EncryptorType::Keys(recipients)))
  }
  