Update to Telegram Bot API 6.1

Author: parsapoorsh

README.md

@@ -1,5 +1,5 @@
 # TelegramBotPHP
-[![API](https://img.shields.io/badge/Telegram%20Bot%20API-April%2016%2C%202022-36ade1.svg)](https://core.telegram.org/bots/api)
+[![API](https://img.shields.io/badge/Telegram%20Bot%20API-June%2020%2C%202022-36ade1.svg)](https://core.telegram.org/bots/api)
 ![PHP](https://img.shields.io/badge/php-%3E%3D7.4-8892bf.svg)
 ![CURL](https://img.shields.io/badge/cURL-required-green.svg)
 
@@ -8,7 +8,7 @@
 [![StyleCI](https://styleci.io/repos/635079074/shield?branch=master)](https://styleci.io/repos/635079074)
 
 A very simple PHP [Telegram Bot API](https://core.telegram.org/bots).    
-Compliant with the April 16, 2022 Telegram Bot API update.
+Compliant with the June 20, 2022 Telegram Bot API update.
 
 Requirements
 ---------

Telegram.php

@@ -795,7 +795,8 @@ public function setWebhook(
         string $ip_address = '',
         int $max_connections = 0,
         array $allowed_updates = [],
-        bool $drop_pending_updates = false
+        bool $drop_pending_updates = false,
+        string $secret_token = ''
     ): array
     {
         $requestBody = ['url' => $url];
@@ -809,6 +810,8 @@ public function setWebhook(
             $requestBody['allowed_updates'] = json_encode($allowed_updates);
         if ($drop_pending_updates)
             $requestBody['drop_pending_updates'] = $drop_pending_updates;
+        if ($secret_token != '')
+            $requestBody['secret_token'] = $secret_token;
 
         return $this->endpoint('setWebhook', $requestBody, true);
     }
@@ -1291,6 +1294,18 @@ public function sendInvoice(array $content): array
         return $this->endpoint('sendInvoice', $content);
     }
 
+    /**
+     * See <a href="https://core.telegram.org/bots/api#createInvoiceLink">createInvoiceLink</a> for the input values.
+     *
+     * @param $content array the request parameters as array
+     *
+     * @return array the JSON Telegram's reply.
+     */
+    public function createInvoiceLink(array $content): array
+    {
+        return $this->endpoint('createInvoiceLink', $content);
+    }
+
     /**
      * See <a href="https://core.telegram.org/bots/api#answershippingquery">answerShippingQuery</a> for the input values.
      *