Update README.md

wrong link

README.md

@@ -28,7 +28,7 @@ The number of the LED always lit on the test unit's dipslay, corresponds to the
 
 To move up between tests, hold down the A button on the test unit micro:bit and push the B button, and vice versa to move down. You can jump directly to test 11 from 1 by going up and vice versa.
 
-_NB!: Simultaneous pushing of buttons in the MakeCode editor's simulator [does not work yet](https://forum.makecode.com/t/2-questions-moving-multiple-blocks-in-editor-and-micro-bit-simulator-keyboard-control/31389?u=vegz78). Therefore, to cycle between the various tests in the simulator, instead manually change the variable `testNumber` to a number between 0 and 10._
+_NB!: Simultaneous pushing of buttons in the MakeCode editor's simulator [does not work yet](https://github.com/microsoft/pxt-microbit/issues/2219). Therefore, to cycle between the various tests in the simulator, instead manually change the variable `testNumber` to a number between 0 and 10._
 
 The various tests:
 1. _Buttons_: The test unit displays arrows when buttons are pressed (A button = left arrow, B button = right arrow, A+B buttons = up arrow)