aern2-mp-0.1.2.0: changelog.md

* v 0.1.2.0 2017-11-14
  * fix compilation with haskell-mpfr
* v 0.1.1.0 2017-11-14
  * using Claude Heiland-Allen's Numeric.Rounded.Simple
* v 0.1.0.1 2017-09-12
  * first release on Hackage
  * backends: hmpfr and (tweaked) rounded