Add note about Skylark migration in android_instrumentation_test doc
Closes
@@ -536,3 +536,7 @@ API_LEVELS = [
- Windows support
- Improved external dependency management
- Remote test caching and execution
+
+We are planning to rewrite the Android rules in [Skylark](https://docs.bazel.build/versions/master/skylark/concepts.html).
+The `android_instrumentation_test` rule will be part of the rewrite, however,
+its usage will remain unchanged from the end-user perspective.
