Add support to set HTTP Client.

Author: irazasyed

src/Telegram.php

@@ -93,6 +93,20 @@ protected function httpClient(): HttpClient
         return $this->http;
     }
 
+    /**
+     * Set HTTP Client.
+     *
+     * @param HttpClient $http
+     *
+     * @return $this
+     */
+    public function setHttpClient(HttpClient $http): self
+    {
+        $this->http = $http;
+
+        return $this;
+    }
+
     /**
      * Send text message.
      *
@@ -134,7 +148,7 @@ public function sendMessage(array $params): ?ResponseInterface
      */
     public function sendFile(array $params, string $type, bool $multipart = false): ?ResponseInterface
     {
-        return $this->sendRequest('send'.Str::studly($type), $params, $multipart);
+        return $this->sendRequest('send' . Str::studly($type), $params, $multipart);
     }
 
     /**