combinatorial-0.1: Changes.md

# Change log for the `combinatorial` package

## 0.1

* added explicit export lists,
  thus hide some helper functions and alternative implementations

* use alternative implementations in tests

* `chooseToIndex` -> `chooseRank`,
  `chooseFromIndex -> chooseUnrank`

## 0.0

* Tests: replaced `(==>)` and custom cardinal types by `QC.forAll`.

* extracted from HTam package