Rename PyTorch.md to pytorch.md

contrib/machine-learning/pytorch.md

@@ -110,4 +110,4 @@ PyTorch is a powerful and flexible deep learning framework that caters to both r
 - [PyTorch Tutorials](https://pytorch.org/tutorials/)
 - [PyTorch Forum](https://discuss.pytorch.org/)
 
-Feel free to explore and experiment with PyTorch to harness the full potential of this versatile framework!
+Feel free to explore and experiment with PyTorch to harness the full potential of this versatile framework!