fix declaration of requestAccessToken method

Author: blat

src/OAuth/OAuth2/Service/Buffer.php

@@ -108,7 +108,7 @@ protected function parseRequestTokenResponse($responseBody)
         return $data['code'];
     }
 
-    public function requestAccessToken($code)
+    public function requestAccessToken($code, $state = null)
     {
         $bodyParams = array(
             'client_id'     => $this->credentials->getConsumerId(),

src/OAuth/OAuth2/Service/Pocket.php

@@ -85,7 +85,7 @@ protected function parseRequestTokenResponse($responseBody)
         return $data['code'];
     }
 
-    public function requestAccessToken($code)
+    public function requestAccessToken($code, $state = null)
     {
         $bodyParams = array(
             'consumer_key'     => $this->credentials->getConsumerId(),

src/OAuth/OAuth2/Service/ServiceInterface.php

@@ -29,10 +29,11 @@ interface ServiceInterface extends BaseServiceInterface
      * Retrieves and stores/returns the OAuth2 access token after a successful authorization.
      *
      * @param string $code The access code from the callback.
+     * @param string $state
      *
      * @return TokenInterface $token
      *
      * @throws TokenResponseException
      */
-    public function requestAccessToken($code);
+    public function requestAccessToken($code, $state = null);
 }