[scribus] OS X compatibility

[Garth Fletcher]

It would be very helpful if the the front page included a list of 
Scribus versions versus compatible OS versions.

I've deciphered it, but only by downloading each release:

Scribus     OS X
1.5.4        10.13 {maybe earlier}
1.5.5        10.13 {special version}
1.5.5        10.14... {standard release}
1.5.6        10.14...
1.5.7        10.14...

It would also be lovely if 10.13 could be supported in 1.5.6 or .7. I'm 
sure I'm not the only Scribus user who is still running 10.13 (High Sierra).

Cordially,

Garth Fletcher