add extra option to MessageSendOptions (#600)

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

index.d.ts

@@ -602,6 +602,8 @@ declare namespace WAWebJS {
         sendSeen?: boolean
         /** Media to be sent */
         media?: MessageMedia
+        /** Extra options */
+        extra?: any
         /** Sticker name, if sendMediaAsSticker is true */
         stickerName?: string
         /** Sticker author, if sendMediaAsSticker is true */

src/Client.js

@@ -462,7 +462,8 @@ class Client extends EventEmitter {
             caption: options.caption,
             quotedMessageId: options.quotedMessageId,
             parseVCards: options.parseVCards === false ? false : true,
-            mentionedJidList: Array.isArray(options.mentions) ? options.mentions.map(contact => contact.id._serialized) : []
+            mentionedJidList: Array.isArray(options.mentions) ? options.mentions.map(contact => contact.id._serialized) : [],
+            ...options.extra
         };
 
         const sendSeen = typeof options.sendSeen === 'undefined' ? true : options.sendSeen;