Modify the `default` suite to use the `saltmajorversion` InSpec input rather than the `version` variable in `pkgs_spec.rb`.
* Automated using https://github.com/myii/ssf-formula/pull/384
Use py3 for latest salt version Use Python 2 on old distros Update Gemfile Updated centos-6 run_command, as it does not use systemd Added tests to verify correct package versions for all cases tested
add travis button to README