add Stow/Util.pm.in with @VERSION@ substitution

This is now necessary in order to prevent pause.perl.org from
complaining:

    Status: Decreasing version number
    =================================

         module : Stow::Util
         version: undef
         in file: lib/Stow/Util.pm
         status : Not indexed because lib/Stow/Util.pm in
                 A/AS/ASPIERS/Stow-v2.2.0.tar.gz has a higher version number
                 (0)

1 files changed, 1 insertions, 0 deletions

diff --git a/META.yml b/META.yml
index da051c4..721ff1c 100644
--- a/META.yml
+++ b/META.yml
@@ -20,6 +20,7 @@ provides:
     version: v2.2.1
   Stow::Util:
     file: lib/Stow/Util.pm
+    version: v2.2.1
 requires:
   Carp: '0'
   IO::File: '0'