add link to demo

section-4-unstructured-data-projects/end-to-end-dog-vision-v2.ipynb

@@ -20,6 +20,7 @@
     "* **Data:** Images of dogs from [Stanford Dogs Dataset](http://vision.stanford.edu/aditya86/ImageNetDogs/) (120 dog breeds, 20,000+ images).\n",
     "* **Problem type:** Multi-class classification (120 different classes).\n",
     "* **Runtime:** This project is designed to run end-to-end in [Google Colab](https://colab.research.google.com/) (for free GPU access and easy setup). If you'd like to run it locally, it will require environment setup.\n",
+    "* **Demo:** See a [demo of the trained model running on Hugging Face Spaces](https://huggingface.co/spaces/mrdbourke/dog_vision).\n",
     "\n",
     "Welcome, welcome!\n",
     "\n",