Update README.md

README.md

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 # SpeeduinoGL
-A work in progress library with basic graphical functions optimised for arm cortex m7.
-Tested on GIGA R1, with rasterization writing to registers between two lines, and basic shapes (triangle, rectangle).Support for processing arrays instead of pixels one by one, and boundary checking are under progress.
+A work in progress library with basic graphical functions optimised for arm cortex m7. Tested on GIGA R1, with rasterization writing to registers between two lines, and basic shapes (triangles, circles and quadrilaterals).Support for processing arrays instead of pixels one by one is in progress.