update todo list

README.md

@@ -17,6 +17,12 @@ a library for parsing Bitsy game data.
 
 ## todo
 
+### fix pixels
+
+I made the assumption that a pixel is "0" or "1". nope. 
+it's an unsigned int and can point to whatever colour you like 
+as long as it exists in the palette.
+
 ### functions
 * sprite from
 * sprite to