DBD::Pg 1.13 released

DBD::Pg 1.13 has been uploaded to CPAN.  This release fixes a
segmentation fault due to falling off the end of a switch statement
when retrieving the pg_type attribute.  Also, the value for
'numeric' types has been added.  Unknown types will now return the
string 'unknown'.  This unfortunately includes all user-defined data
types.

If anyone asks for it, I could improve the pg_type operation to
actually use the pg_type table to lookup types at runtime.

-jwb