Version 1.0.3 (2017-06-06)
==========================
* Add `gmp::mpq_numref_const()`, `gmp::mpq_denref_const()`,
`mpc::realref_const()` and `mpc::imagref_const()`.
* Add inline version of functions which are inline in gmp.h, mpfr.h.
* Bug fix: `gmp::mpz_even_p()`.
Version 1.0.2 (2017-05-20)
==========================
* Add features `mpfr` and `mpc`, which are enabled by default, to
allow opting out of the MPFR and MPC libraries.
Version 1.0.1 (2017-05-06)
==========================
* Expliciltly link to gcc_eh and pthread under MinGW.
Version 1.0.0 (2017-04-24)
==========================
* GMP 6.1.2, MPFR 3.1.5, MPC 1.0.3