Update README.md

README.md

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 This dataset is generated as a part of a tutorial on fitting PyTorch models. The tutorial is at [github.com/sdtemple/zootopia3](https://github.com/sdtemple/zootopia3).
 
-You can generate your own data with [answers/simulation-exercise.ipynb](https://github.com/sdtemple/zootopia3/answers/simulation-exercise.ipynb) at the repo.
+You can generate your own data with [answers/simulation-exercise.ipynb](https://github.com/sdtemple/zootopia3/blob/main/answers/simulate-exercise.ipynb) at the repo.
 
 Treat this as held-out test data, with 20 examples for each shape (4) and color (8) combo.