Merge pull request #19 from tremby/user-data-processor-docs

Document UserDataProcessor data sent when no user

Author: pulkitjalan

src/Processors/UserDataProcessor.php

@@ -19,6 +19,10 @@
  * By default only the 'id' field from the user is attached; pass null or an
  * empty array as the 'only' option to override this, or configure otherwise as
  * you see fit.
+ *
+ * If no user is logged in, the data `['id' => null]` is still attached to the
+ * error object, to differentiate a case where no data on the current user is
+ * available from a case where it is known that no user is logged in.
  */
 class UserDataProcessor
 {