poly-0.3.0.0: changelog.md

# 0.3.0.0

* Implement sparse polynomials.
* Add `GcdDomain` and `Euclidean` instances.
* Add functions `leading`, `monomial`, `scale`.
* Remove function `constant`.

# 0.2.0.0

* Fix a bug in `Num.(-)`.
* Add functions `constant`, `eval`, `deriv`, `integral`.
* Add a handy pattern synonym `X`.

# 0.1.0.0

* Initial release.