update to latest upstream version
    
    - update by Fedora::App::MaintainerTools 0.006
    - updating to latest GA CPAN version (0.18)
    - added a new br on perl(Exporter) (version 0)
    - altered br on perl(ExtUtils::MakeMaker) (6.42 => 6.31)
    - added a new br on perl(Package::Stash) (version 0.03)
    - added a new br on perl(constant) (version 0)
    - added a new br on perl(vars) (version 0)
    - dropped old BR on perl(Symbol)
    - dropped old requires on perl(Symbol)
    - manually drop unnecesary requires