Increment missing version in META.yml

Author: timlegge

META.yml

@@ -28,6 +28,6 @@ resources:
   bugtracker: https://github.com/perl-net-saml2/perl-Crypt-OpenSSL-Verify/issues
   license: http://dev.perl.org/licenses
   repository: https://github.com/perl-net-saml2/perl-Crypt-OpenSSL-Verify
-version: '0.20'
+version: '0.28'
 x_serialization_backend: 'CPAN::Meta::YAML version 0.018'