SWISS-PROT 39 allows multiple AC lines (38 didn't)

Full_Name: Murad Nayal
 ...
There is a bug in Bio::Index::Swissprot::_index_file() it appears when
the sequence has more than one AC line, all accession numbers besides
the ones on the last line will not be indexed (@accs array will be
overwritten at every line). diffs below

        } elsif (/^AC(.*)/) { # ignore ? if there.
!           @accs = ($1 =~ /\s*(\S+);/g);
        } else {
            # do nothing
        }
 ==================
        } elsif (/^AC(.*)/) { # ignore ? if there.
!           push(@accs,($1 =~ /\s*(\S+);/g));
        } else {
            # do nothing
        }