Revert "generate.pl: temporarily skip generating for older Perls"

This reverts commit 1edb705.

Should be fine now that
https://metacpan.org/release/BINGOS/Devel-PatchPerl-2.00 fixes failing
patches.

Author: zakame

generate.pl

@@ -5,7 +5,6 @@
 use YAML::XS;
 use Devel::PatchPerl;
 use LWP::Simple;
-use version 0.77;
 
 sub die_with_sample {
   die <<EOF;
@@ -103,7 +102,6 @@ sub die_with_sample {
 }
 
 for my $release (@{$config->{releases}}) {
-  next unless version->parse($release->{version}) >= version->parse('5.28.0');
   do { die_with_sample unless $release->{$_} }
     for (qw(version sha256));