Adding support for os display

src/ilidisplay.rs

@@ -155,4 +155,9 @@ impl IliDisplay {
        self.spi.write(imagedata_ref).map_err(|err| println!("SPI error in send_image: {}", err.to_string())).unwrap();
      }
    }
+
+      pub fn update(&mut self) -> () {
+      }
+
+
 }