Update to 0.07
    
    - New upstream release 0.07
      - Made Math::BigInt::* dependency dynamic to avoid Math::BigInt falling back
        to BigInt backends that are too slow for practical use
    - This release by MITHALDU -> update source URL
    - Always require perl(Math::BigInt) >= 1.60 and perl(Math::BigInt::GMP) ≥ 1.24
    - Drop BR: perl(Test::More) as it's bundled
    - BR: perl(Test::Builder::Module), requirement of bundled perl(Test::More)
    - BR: perl(base), perl(Cwd), perl(File::Path), perl(File::Spec),
      perl(File::Temp) and perl(Text::ParseWords) for installer
    - Use --skipdeps with Makefile.PL to stop it trying to download and install
      Math::BigInt::Pari
    - Drop without-checks conditional as test suite is no longer slow
    - Remove unnecessary exec bits from files in upstream tarball
    - Package README, with fixed line endings