Fix link for Programming the BBC micro:bit book.

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README.md

@@ -672,7 +672,7 @@ Useful Articles for developing on the micro:bit.
 - [Programming with MicroPython](https://www.oreilly.com/library/view/programming-with-micropython/9781491972724/) - Embedded Programming with Microcontrollers and Python.
 - [Getting Started with the micro:bit](https://www.oreilly.com/library/view/getting-started-with/9781680453010/) - Coding and Making with the BBC's Open Development Board.
 - [The Official BBC micro:bit User Guide](https://www.wiley.com/en-gb/The+Official+BBC+micro:bit+User+Guide+-p-9781119386735) - The go-to guide to getting started with the BBC micro:bit and exploring all of its amazing capabilities.
-- [Programming the BBC micro:bit](http://simonmonk.org/prog-mb/) - Getting Started with MicroPython.
+- [Programming the BBC micro:bit](http://simonmonk.org/prog-mb) - Getting Started with MicroPython.
 - [Networking with the micro:bit (ebook)](https://github.com/nominetresearch/microbit-networking-book) - This book presents a series of activities to teach the basics of computer networks with micro:bit.
     - [Networking with the micro:bit - Python Edition](https://github.com/nominetresearch/microbit-networking-book-python) - A version of the book with using the Python language.
     - [Prácticas de redes con placas micro:bit](https://github.com/jemole/microbit-networking-book) - Spanish translation.