Dropping 5.6.0 support

[Gervase Markham]

Bradley Baetz wrote:
> The latest DBI release has as a changelog item:
> 
>   NOTE: Future versions of the DBI *will not* support perl 5.6.0 or earlier.
>   : perl 5.6.1 will be the minimum supported version.
> 
> This is something happening in the future, not now, and I don't know of
> any specific feature we'd be needing from a newer DBI, but I think tha
> this should probably be considered advance warning, or something.
> Perhaps we should document this somewhere?

What distributions or OSes shipped with 5.6.0 as the default?

Gerv