hydrogen-prelude-0.2.1: CHANGELOG.md

## v0.1
+ initial release
+ ***deprecated***

## v0.1.0.1
+ Patch: Modules were not properly exported in Cabal file

## v0.1.1
+ Added `module Numeric`, `Data.Map (Map)`, and `Data.Set (Set)`

## v0.2
+ Added `for`

## v0.2.0.1
+ Added CHANGELOG.md to source package

## v0.2.1
+ Added __
+ Also exports `Data.Ix`, `Data.Array`, `Data.Bits`, `Data.Ratio`, `Data.Complex`