Merge pull request #594 from sulu-cmf/hotfix/sitemap-alternate

Fixed #588 sitemap alternate link bugs
added changelog
fixed internal link security bug
updated changelog
Merge pull request #609 from sulu-cmf/bugfix/snippet-internal-link-security

fixed internal link security bug
fixed typo
added husky lib
added another paragraph in upgrade.md for permissions
Merge remote-tracking branch 'origin/develop'

Conflicts:
	CHANGELOG.md
adapted upgrade
Merge branch 'master' into develop
update changelog