feat: send media as document (#490)

Co-authored-by: Pedro S. Lopez <pslamoros@hotmail.com>

src/Client.js

@@ -420,6 +420,7 @@ class Client extends EventEmitter {
      * @typedef {Object} MessageSendOptions
      * @property {boolean} [linkPreview=true] - Show links preview
      * @property {boolean} [sendAudioAsVoice=false] - Send audio as voice message
+     * @property {boolean} [sendMediaAsDocument=false] = Send media as a document
      * @property {boolean} [parseVCards=true] - Automatically parse vCards and send them as contacts
      * @property {string} [caption] - Image or video caption
      * @property {string} [quotedMessageId] - Id of the message that is being quoted (or replied to)
@@ -440,6 +441,7 @@ class Client extends EventEmitter {
         let internalOptions = {
             linkPreview: options.linkPreview === false ? undefined : true,
             sendAudioAsVoice: options.sendAudioAsVoice,
+            sendMediaAsDocument: options.sendMediaAsDocument,
             caption: options.caption,
             quotedMessageId: options.quotedMessageId,
             parseVCards: options.parseVCards === false ? false : true,