Changelog for ansigraph-0.3.0.0

Ansigraph Changelog

Change all IO operations to work over any MonadIO. Since GHC 8 this is available in base, so the dependency on transformers is only required for previous versions.
Support GHC versions back to 7.6.
Reexport the Color and ColorIntensity data types from ansi-terminal for full use of the range of ANSI colors without importing that package.

Improved method of displaying animations so that successive frames overwrite previous ones instead of generating many pages of output. This requires the addition of the graphHeight :: Graphable a => a -> Int type class method.
Improved matrix graphing. Now there are distinct colors to represent positive and negative values, as well as real versus imaginary components. Examples added.
The Coloring data type representing possible terminal colorings has been changed to take Maybe AnsiColors, where Nothing indicates use of the default terminal colors.
Some names have been changed for greater clarity and consistency.
Dependency bounds updated for GHC 8.

Initial release.