Update README.md

wording

Author: HughMaingauche

README.md

@@ -7,7 +7,7 @@ This is an upgrade of my [previous](https://github.com/HughMaingauche/PICO-VGA-M
 This library uses 3 PIO statemachines and 2 DMA channels
 A full framebuffer and a font, once loaded in memory, will leave approx 280k of available memory to do stuff and use a VGA monitor directly connected to the PICO
 
-Other immrovements are:
+Other improvements are:
 - Use of the DMA included library instead of direct registry modification
 - Chaged the font system to use xglcd fonts (from [rdagger library](https://github.com/rdagger/micropython-ili9341/tree/master))
 - Added a plotting library to do real time plotting more easily