Log Message:
www/ruby-rack16: update to 1.6.13

1.6.12 (2019-12-08)

Security

[CVE-2019-16782] Prevent timing attacks targeted at session ID lookup.
BREAKING CHANGE: Session ID is now a SessionId instance instead of a String.
(@tenderlove, @rafaelfranca)

1.6.13 (2020-02-08)

* Merge pull request #1462 from jeremyevans/sessionid-to_s
* Handle case where session id key is requested but it is missing