feat: send audio as voice note

This adds the 'sendAudioAsVoice' option for messages

close #160

src/Client.js

@@ -382,6 +382,7 @@ class Client extends EventEmitter {
     async sendMessage(chatId, content, options = {}) {
         let internalOptions = {
             linkPreview: options.linkPreview === false ? undefined : true,
+            sendAudioAsVoice: options.sendAudioAsVoice,
             caption: options.caption,
             quotedMessageId: options.quotedMessageId,
             mentionedJidList: Array.isArray(options.mentions) ? options.mentions.map(contact => contact.id._serialized) : []