fix typo

Author: 張洪偉

README.md

@@ -70,7 +70,7 @@ sense.**
 * Run the model.
   [amazon.ipynb](examples/amazon/amazon.ipynb)
 * An example using [pytorch-lightning](https://github.com/williamFalcon/pytorch-lightning).
-  [amazon-lighting.ipynb](examples/amazon/amazon-lighting.ipynb)
+  [amazon-lightning.ipynb](examples/amazon/amazon-lightning.ipynb)
 
 **accuracy**