Note new warning in subtrait dispatch question

warning: trait `Derived` is never used --> questions/027-subtrait-dispatch.rs:7:7 | 7 | trait Derived: Base { | ^^^^^^^ | = note: `#[warn(dead_code)]` on by default
dtolnay · Feb 8, 2024 · f59e31d · f59e31d
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diff --git a/questions/027-subtrait-dispatch.md b/questions/027-subtrait-dispatch.md
@@ -1,5 +1,6 @@
 Answer: 11
 Difficulty: 1
+Warnings: dead_code
 
 # Hint