getTargetNextMajorUpgradeFile example

$append[] = $upgrade;
            }
        }
        if (!\count($append)) {
            return $output;
        }

        $nextMajorVersionHeadline = '# ' . $this->getNextMajorVersion($version) . '.0.0' . \PHP_EOL;

        array_unshift($append, sprintf('## Introduced in %s', $version));

        $upgradeFile = $this->getTargetNextMajorUpgradeFile($version);
        if (!$dryRun) {
            if (!$this->filesystem->exists($upgradeFile)) {
                $this->filesystem->touch($upgradeFile);
            }

            $content = file_get_contents($upgradeFile) ?: '';

            $posLatestRelease = strpos($content, '# ');
            $posLatestRelease = $posLatestRelease ?: 0;

            $content
                =