Update dart.md

Author: mit-mit

docs/tutorials/basic/dart.md

@@ -8,10 +8,6 @@ type: markdown
 <p class="lead">This tutorial provides a basic Dart programmer's introduction to
 working with gRPC.</p>
 
-<p class="note">Dart gRPC is currently in beta. Please help us out by
-<a href="https://github.com/grpc/grpc-dart/issues/new">filing issues</a>
-if you encounter any.</p>
-
 By walking through this example you'll learn how to:
 
 - Define a service in a .proto file.
@@ -546,3 +542,10 @@ Likewise, to run the client:
 ```sh
 $ dart bin/client.dart
 ```
+
+## Reporting issues
+
+Should you encounter an issue, please help us out by
+<a href="https://github.com/grpc/grpc-dart/issues/new">filing issues</a>
+in our issue tracker.</p>
+