Lynis 2.6.4 (2018-05-02)

Changes:

• Several contributions merged, including grammar improvements
• Initial support for Ubuntu 18.04 LTS
• Small enhancements for usage

Tests:

• [AUTH-9308] - Made 'sulogin' more generic for systemd rescue shell
• [DNS-1600] - Initial work on DNSSEC validation testing
• [NETW-2704] - Added support for local resolver 127.0.0.53
• [PHP-2379] - Suhosin test disbled
• [SSH-7408] - Removed 'DELAYED' from OpenSSH Compression setting
• [TIME-3160] - Improvements to detect step-tickers file and entries