Create another For iterator that leaves out the fake null rune

Apparently it was intended behavior. Closes #4

drawer.go

@@ -13,20 +13,20 @@ type Drawer struct { TypeSetter }
 // Draw draws the drawer's text onto the specified canvas at the given offset.
 func (drawer Drawer) Draw (
 	destination draw.Image,
-	color       color.Color,
+	col         color.Color,
 	offset      image.Point,
 ) (
 	updatedRegion image.Rectangle,
 ) {
-	source := image.NewUniform(color)
+	source := image.NewUniform(col)
 	
-	drawer.For (func (
+	drawer.ForRunes (func (
 		index    int,
 		char     rune,
 		position fixed.Point26_6,
 	) bool {
 		// leave empty space for space characters
-		if unicode.IsSpace(char){
+		if unicode.IsSpace(char) {
 			return true
 		}
 		
@@ -37,7 +37,7 @@ func (drawer Drawer) Draw (
 		mask, maskPoint, _, ok := drawer.face.Glyph(dot, char)
 		// tofu
 		if !ok {
-			drawer.drawTofu(char, destination, color, dot)
+			drawer.drawTofu(char, destination, col, dot)
 			return true
 		}