Messagestream wrongly described

[piegus]

When phpstan run through my code it gave me error due to bad docs:

Parameter $messageStream of method Postmark\PostmarkClient::sendEmailWithTemplate() expects array|null, string|null given

This is how I use your template:

my Mail::getMessageStream looks like:

    public function getMessageStream():?string
    {
        return $this->messageStream;
    }

\Postmark\PostmarkClient::sendEmailWithTemplate

When in postmark application I see that

I think that documentation should'd be changed to:

[ewood-ac]

I have fixed this in the next release. Thanks for bringing it to our attention.