Update to 0.12
    
    - New upstream release 0.12:
      - Complete pure-perl implementation in addition to the one based on
        Variable::Magic; you can specify the implementation explicitly by use-ing
        B::Hooks::EndOfScope::PP or B::Hooks::EndOfScope::XS, or by setting
        $ENV{B_HOOKS_ENDOFSCOPE_IMPLEMENTATION} to either 'XS' or 'PP'
      - Switch from using Sub::Exporter to the more conservative
        Sub::Exporter::Progressive
    - Add patch to fix POD coverage issues in new pure-perl implementation
    - This release by BOBTFISH -> update source URL
    - BR: perl(ExtUtils::CBuilder) ≥ 0.26, perl(Devel::Hide) ≥ 0.0007,
      perl(Module::Implementation) ≥ 0.05 and perl(Module::Runtime) ≥ 0.012
    - BR: perl(Sub::Exporter::Progressive) rather than perl(Sub::Exporter)
    - BR: perl(base), perl(constant), perl(Hash::Util::FieldHash) and
      perl(Scalar::Util) for the pure-perl implementation