Fix syntax highlighting in README

jam1garner · web-flow · commit c921ab843b6f · 2022-09-17T17:05:06.000-04:00
diff --git a/README.md b/README.md
@@ -33,7 +33,7 @@ readers and writers using ✨macro magic✨.
 
 ## Usage
 
-```
+```rust
 #[derive(BinRead)]
 #[br(magic = b"DOG", assert(name.len() != 0))]
 struct Dog {
