Usage
-----
$ termplot                                         \
	up1:'uptime | awk "{ print \$8 }"'         \
	mem:'free | awk "/Mem:/ { print \$3 }"'    \
	wlan0:'iw dev wlan0 link | awk "/bitrate/ { print \$3 }"'

up1   0.0      ▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄
mem   150464.0 ▆▇▇██▇▇▇▆▇▇▆▆▆▅▆▆▅▅▅▅▅▇▇▆▅▅▅▄▃▄▂▂
wlan0 43.3     ▆▆▆▆▆▆▆▆▆▆█▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▄▄ ▄▆▆▄


+ Inspired by: https://github.com/holman/spark
+ Powered by the awesome library: https://hackage.haskell.org/package/brick