Add link to Trello board;

README.md

@@ -43,6 +43,7 @@ lua tests/runner.lua skipUntil
 Related
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+- [Trello board](https://trello.com/b/Q9dJicKK) for project roadmap and discussion.
 - [RxLove](https://github.com/bjornbytes/RxLove)
 
 License