ISendMailOptions type does not match with nodemailer

[gaara4896]

In send-mail-options.interface.ts, below code can be found

export interface ISendMailOptions extends SendMailOptions {
  ...
  text?: string | Buffer;
  ...
}

Below are obtain from original nodemailer doc, original source from https://nodemailer.com/message/

text - The plaintext version of the message as an Unicode string, Buffer, Stream or an attachment-like object ({path: ‘/var/data/…’})

Text should be able to take in attachment-like object, instead of just string or Buffer.

I suggest the type to be updated to as below

export interface AttachmentLikeObject {
  path: string;
}

export interface ISendMailOptions extends SendMailOptions {
  ...
  text?: string | Buffer | AttachmentLikeObject;
  ...
}