writer/WRITER.md fix broken link.

writer/WRITER.md

@@ -15,7 +15,7 @@ display driver is subclassed from the `framebuf` class. Examples are:
  * The [HX1230 96x68 LCD](https://github.com/mcauser/micropython-hx1230.git).
  * A driver for Sharp ultra low power consumption monochrome displays such as
  [2.7 inch 400x240 pixels](https://www.adafruit.com/product/4694)
- is [here](./drivers/sharp/README.md).
+ is [here](https://github.com/peterhinch/micropython-nano-gui/tree/master/drivers/sharp).
  * Drivers for Adafruit ST7735R based TFT's: 
  [1.8 inch](https://www.adafruit.com/product/358) and
  [1.44 inch](https://www.adafruit.com/product/2088) are