Update versions in the book

nicholasbishop · nicholasbishop · commit 16148b45a9be · 2022-11-15T16:42:54.000-05:00
diff --git a/book/src/tutorial/app.md b/book/src/tutorial/app.md
@@ -18,8 +18,8 @@ In `cargo.toml`, add a few dependencies:
 ```toml
 [dependencies]
 log = "0.4"
-uefi = "0.17"
-uefi-services = "0.14"
+uefi = "0.18"
+uefi-services = "0.15"
 ```
 
 Replace the contents of `src/main.rs` with this:
