Test-Simple: allow optional subtest args

undocumented but used by e.g. WWW-Mechanize.
So add documentation and support for it.

Author: rurban

dist/Test-Simple/lib/Test/More.pm

@@ -681,7 +681,7 @@ sub new_ok ($class, $args?, $object_name?) {
 
 =item B<subtest>
 
-    subtest $name => \&code;
+    subtest $name => \&code, @args;
 
 C<subtest()> runs the &code as its own little test with its own plan and
 its own result.  The main test counts this as a single test using the
@@ -742,8 +742,8 @@ subtests are equivalent:
 
 =cut
 
-sub subtest ($name, $subtests) {
-    Test::More->builder->subtest($name, $subtests);
+sub subtest ($name, $subtests, @args) {
+    Test::More->builder->subtest($name, $subtests, @args);
 }
 
 =item B<pass>

pod/perlcdelta.pod

@@ -756,6 +756,8 @@ systems.
 
 =item Test-Simple
 
+Add doc and support for optional subtest @args.
+
 Moved from cpan to dist.
 L<[cperl #154]|https://github.com/perl11/cperl/issues/154>.