fix: add missing type definitions (#278)

* fix: @todo docs improvements

* fix: add ClientInfo to Client typings

* add ClientInfoPhone

* fix: set getBatteryStatus as async

* add ClientInfo comment

Co-authored-by: Pedro S. Lopez <pedroslopez@me.com>

src/Client.js

@@ -15,6 +15,7 @@ const { ClientInfo, Message, MessageMedia, Contact, Location, GroupNotification
 /**
  * Starting point for interacting with the WhatsApp Web API
  * @extends {EventEmitter}
+ * @param {object} options
  * @fires Client#qr
  * @fires Client#authenticated
  * @fires Client#auth_failure
@@ -370,7 +371,7 @@ class Client extends EventEmitter {
 
     /**
      * Returns the version of WhatsApp Web currently being run
-     * @returns Promise<string>
+     * @returns {Promise<string>}
      */
     async getWWebVersion() {
         return await this.pupPage.evaluate(() => {
@@ -610,6 +611,7 @@ class Client extends EventEmitter {
 
     /**
      * Check if a given ID is registered in whatsapp
+     * @param {string} id the whatsapp user's ID
      * @returns {Promise<Boolean>}
      */
     async isRegisteredUser(id) {