This patch does a couple of things:
1. Fix the compilation of the example, Message -> MessageLike
2. Update Webpack and friends for the example
3. Remove futures-timer's Delay method and use equivalent methods from
Tokio and wasm-timers.
The last point was needed because futures-timer would end up triggering
this error:
ReferenceError: can't access lexical declaration '__wbg_clearTimeout_d8b36ad8fa330187' before initialization
Damir Jelić