Fix tests on mswin32 [minor]

Also, bump version number

Author: Chris White

lib/Text/PerlPP.pm

@@ -5,7 +5,7 @@ package Text::PerlPP;
 
 # Semantic versioning, packed per Perl rules.  Must always be at least one
 # digit left of the decimal, and six digits right of the decimal.
-our $VERSION = '0.500002';
+our $VERSION = '0.500003';
 
 use 5.010001;
 use strict;

t/05-external-command.t

@@ -38,7 +38,7 @@ do {
 	is($out, "howdy\n", "basic echo");
 };
 
-if (any { $_ eq $^O } 'dos', 'os2', 'MSWin') {
+if (any { $_ eq $^O } 'dos', 'os2', 'MSWin32') {
 	skip "I don't know how to run the rest of the tests on $^O", $ntests-1;
 	exit;
 }