Replace [colorama](https://github.com/tartley/colorama/) dependency with [pastel](https://github.com/sdispater/pastel). This requires updating the `<fg:color>` markup to `<fg=color>`, but it is more expressive than the previous custom-made markup.
We also have a new logo.
3.1
Use the class docstring instead of the `_intro` attribute.
3.0
- Class-based, which means you can compose and extend with inheritance and mixins. - Subcommands are just attributes that are classes. - Improve the usability of the markup system.