upd

src/User.php

@@ -1,13 +1,13 @@
 <?php
 
-namespace 1Sept\OAuth2\Client\Provider;
+namespace Sept\OAuth2\Client\Provider;
 
 use League\OAuth2\Client\Provider\ResourceOwnerInterface;
 
 /**
  * @see     https://vk.com/dev/fields
  *
- * @package 1Sept\OAuth2\Client\Provider
+ * @package Sept\OAuth2\Client\Provider
  */
 class User implements ResourceOwnerInterface
 {

src/Vkontakte.php

@@ -1,6 +1,6 @@
 <?php
 
-namespace 1Sept\OAuth2\Client\Provider;
+namespace Sept\OAuth2\Client\Provider;
 
 use League\OAuth2\Client\Provider\AbstractProvider;
 use League\OAuth2\Client\Provider\Exception\IdentityProviderException;