Update index.md

tutorials/index.md

@@ -1,3 +1,7 @@
+## Warning
+
+These tutorials work with code at `HEAD`, which is not semver compatible with the current published release. Refer to the tutorials in the [`release/1.5` branch](https://github.com/unicode-org/icu4x/tree/release/1.5) instead.
+
 # ICU4X Tutorials
 
 Welcome! We're glad you want to try out ICU4X! This page serves as a landing page for people looking to perform various tasks with ICU4X.
@@ -24,4 +28,4 @@ Contributors should also check out [CONTRIBUTING.md].
  [cpp.md]: ./cpp.md
  [js.md]: ./js.md
  [icu-crate-docs]: https://docs.rs/icu/latest/icu/
- [CONTRIBUTING.md]: ../../CONTRIBUTING.md
+ [CONTRIBUTING.md]: ../../CONTRIBUTING.md