Bug#902582: (some kind of) transition: add python3.7 as a supported python3 version

["Adam D. Barratt" <adam@adam-barratt.org.uk>]

On Sun, 2018-09-23 at 15:40 +0200, Andreas Beckmann wrote:
> Followup-For: Bug #902582
> 
> Hi,
> 
> the ben file is bad since it misses -dbg packages, the following
> should
> work better:
> 
> is_affected = .build-depends ~ /python3-all-dev/;
> is_good = .depends ~ /python3 \(<< 3\.8\)/ | .depends ~ /python3.7/ |
> /python3-dbg \(<< 3\.8\)/ | .depends ~ /python3.7-dbg/;

That's missing a ".depends ~" on the third clause, making ben unhappy;
fixed.

Regards,

Adam