Update readme.md

readme.md

@@ -7,7 +7,7 @@
 
 - _Modeling to Learn_ [blue guides](https://mtl.how/blue) and _Modeling to Learn_ [red guides](https://mtl.how/red) are in the two folders at the top of this page.
 - **Use the map below to decide which guides you should use.**
-- Just curious about _Modeling to Learn_? Check out [mtl.how/demo](https//mtl.how/demo).
+- Just curious about _Modeling to Learn_? Check out [mtl.how/demo](https://mtl.how/demo).
 
 [<img src = "https://github.com/lzim/teampsd/blob/master/resources/maps/mtl.how_map.png">](https://mtl.how)