v2.1.0: Improvements for Windows, new boxes & helpers!

Version 2.1.0

This update is mostly focused on bug fixes, but also has some additions. The
library should now actually install on Windows machines, which is pretty dapper.

Items marked in bold are API breaking changes.

Removals

• Remove broken SIGWINCH monitor (#25, #19)

Additions

• Add Container.scroll and Container.scroll_end helpers (0119e31)
• Add SINGLE box type, rename old SINGLE box to ROUNDED (5dda727)

Fixes

• Fix some issues with InputField (0920ffc)
• Improve how terminal resize events are handled (7143aff)
• Fix 1 char offset in non-Container widget widths (e3ac8d7)

Showcase

Here is an image of my first major project with the library, Pagoda.