added $keyType = 'string' to Token model

Author: freezer278

src/Token.php

@@ -13,6 +13,13 @@ class Token extends Model
      */
     protected $table = 'oauth_access_tokens';
 
+    /**
+     * The "type" of the primary key ID.
+     *
+     * @var string
+     */
+    protected $keyType = 'string';
+
     /**
      * Indicates if the IDs are auto-incrementing.
      *