Updated module requirements.

Build.PL

@@ -6,7 +6,15 @@ use Module::Build;
 Module::Build->new( module_name => 'File::DirWalk',
                     author      => 'jens.luedicke@gmail.com',
                     license     => 'perl',
-                    requires    => {'Test::Simple' => '0.72'},
+                    requires    => {
+                        'Carp'           => '1.08',
+                        'File::Spec'     => '3.2501',
+                        'File::Basename' => '2.76',
+                    },
+                    recommends => {
+                        'Test::More'   => '0.72',
+                        'Test::Exception' => '0.27'
+                    },
                     sign        => 1,
                     create_makefile_pl => 'traditional',
                   )->create_build_script;