Maintenance

Security

This fixes a security vulnerabilities in symfony/http-foundation and symfony/http-kernel:

• https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/http-foundation/CVE-2019-18888.yaml
• https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/http-kernel/CVE-2019-18887.yaml

Other

Set default value of ttl to 900 instead of null in ConfigHelper::getRequestLimitRuleset.