Change date

index.html

@@ -40,11 +40,11 @@ To be published by MIT Press.
 <br>
 Citation:
 <pre><code>
- @book{prince2022understanding,
+ @book{prince2023understanding,
  author = "Simon J.D. Prince",
  title = "Understanding Deep Learning",
  publisher = "MIT Press",
- year = 2022,
+ year = 2023,
  url = "https://udlbook.github.io/udlbook/"
 }
 </code></pre>