Add Ruby 2.6.3 as the new default
Add Ruby 2.6.3 as the new default

This is mostly about adding support for the new Japanese cal era, but it
fixes a few minor bugs as well.

Signed-off-by: Tim Smith <764ef62106582a09ed09dfa0b6bff7c05fd7d1e4@chef.io>

higanworks/omnibus-software,chef/omnibus-software,mattray/omnibus-software,chef/omnibus-software,aerobase/omnibus-software,higanworks/omnibus-software,aerobase/omnibus-software,mattray/omnibus-software,chef/omnibus-software,mattray/omnibus-software,aerobase/omnibus-software,aerobase/omnibus-software,chef/omnibus-software,mattray/omnibus-software,higanworks/omnibus-software,aerobase/omnibus-software,chef/omnibus-software,chef/omnibus-software,higanworks/omnibus-software,mattray/omnibus-software