0.03
     - Expand coverage to include environments that don't provide __uint128_t
     - Add Math::Ryu::Debug.
     - Add s2d().
     - Ensure that Newxz() is defined.

0.02
     - Fix big in t/mpfr_checks.t (No allowance was being made for the possibility
       that atonv() or nvtoa() might not be available.

0.01 - First release.
