* Throw an exception on attempt to create impersonation token with a non-stateful guard
* Test that impersonation tokens can only be created with a stateful guard
* Fix code style (php-cs-fixer)
* Escape backslashes in the exception's message
Co-authored-by: Samuel Štancl <samuel.stancl@gmail.com>
* Make the exception only about requiring a stateful guard
Co-authored-by: PHP CS Fixer <phpcsfixer@example.com>
Co-authored-by: Samuel Štancl <samuel.stancl@gmail.com>
