Cannot send session cache limiter - headers already sent

[staabm]

We have some test using session_start() etc and because of the output created by this result printer we run into Cannot send session cache limiter - headers already sent errors.

Not sure why this does not happen with the default result printer... maybe you print to early or something?

https://github.com/redaxo/redaxo/pull/3172/checks?check_run_id=397516031

[staabm]

I guess the reason could be that https://github.com/mheap/phpunit-github-actions-printer/blob/master/src/Printer.php#L52 contains a newline and therefore output might get flush'ed immediately

[mheap]

@staabm Could you try with v1.1.0? There was a bug with some errors that caused a warning which would have written to stdout