Bump to version 0.4.2

Changelog:
* 90cdf8e5a1daf1e0cef769fe545d9412ffda2fa3: Indentation fixes.
* 4d5c4d46adffdaffbec53140cd308d9ce8258706: Minor typography changes.
* dbbf017c30fb5f00a6b7d3f7a7e5e7ffdfe5edc2: Increased min-width
requirement for fluid grids.
Added test patterns for list elements.