protected function splitChangelog($file, $version)
    {
        $lines = explode("\n", file_get_contents($file));

        // split the file into relevant parts
        $start = [];
        $changelog = [];
        $end = [];

        $state = 'start';
        foreach ($lines as $l => $line) {
            // starting from the changelogs headline
            if (isset($lines[$l - 2]) && strpos($lines[$l - 2], $version) !== false &&
                isset($lines[$l - 1]) && strncmp($lines[$l - 1], '---', 3) === 0) {
                $state = 'changelog';
            }
            if ($state === 'changelog' && isset($lines[$l + 1]) && strncmp($lines[$l + 1], '---', 3) === 0) {
                $state = 'end';
            }
            // add continued lines to the last item to keep them together
            if (!empty(${$state}) && trim($line) !== '' && strncmp($line, '- ', 2) !== 0) {
                end(${$state});
                ${$state}[key(${$state})] .= "\n" . $line;
            } else {
                ${$state}[] = $line;
            }
        }

        return [$start, $changelog, $end];
    }