Use current package for Nix shell

Adjust build system

Green tint text

Lock inputs to fix build

Release 1.4

Render on WM events

Update Nix flake

Do not back up one word on unpause

Add repology badge to readme

Suppress screensaver

Version 1.3

Adjust WPM with mouse wheel

It might be possible to optimize rendering by caching the WPM
indicator.

Support for loading OTF and SVG font files

Version 1.2

Don't delay commas the same as periods

Add delay for difficult words

Add delay if a word is short, long, or begins or ends with a
non-alphabetic rune.

Version 1.1

Clear words on paste

Store words in a seq, not a Deque

Version 1.0