message: README: add missing REST roadmap item
diff: @@ -18,7 +18,8 @@ The next steps will be:
  - Add Camera settings and actions interface.
  - Publish Android wrappers in Java using JNI.
  - Publish iOS wrappers in Objective-C using Objective-C++.
  -- Improve Offboard control.
  +- Publish REST wrapper.
  +- Add features as needed.
  ## Interfacing
  