Add Teaful as "Built with Microbundle" in README (#910)

Author: aralroca

README.md

@@ -374,6 +374,8 @@ Here's what's coming up for Microbundle:
 - [hooked-form](https://github.com/JoviDeCroock/hooked-form) A lightweight form-management library for React.
 - [goober](https://github.com/cristianbote/goober) Less than 1KB css-in-js alternative with a familiar API.
 - [react-model](https://github.com/byte-fe/react-model) The next generation state management library for React
+- [Teaful](https://github.com/teafuljs/teaful) Tiny, easy and powerful (P)React state management
+
 
 ## 🥂 License