feat: approve, reject, list request join (#117)

README.md

@@ -847,6 +847,21 @@ Of course, replace ``` xyz ``` with an actual ID.
     ```
   Of course, replace ``` xxx ``` with invitation code.
 
+- To get list request join
+    ``` ts
+    const response = await sock.groupRequestParticipantsList("abcd-xyz@g.us")
+    console.log(response)
+    ```
+- To approve/reject request join
+    ``` ts
+    const response = await sock.groupRequestParticipantsUpdate(
+        "abcd-xyz@g.us", // id group,
+        ["abcd@s.whatsapp.net", "efgh@s.whatsapp.net"],
+        "approve" // replace this parameter with "reject" 
+    )
+    console.log(response)
+    ```
+
 ## Privacy
 - To get the privacy settings
     ``` ts