docs: add redux-ts-utils to "cool things made with immer"

readme.md

@@ -638,6 +638,7 @@ console.log(increment(base).counter) // 1
 -   [immer-wieder](https://github.com/drcmda/immer-wieder#readme) _State management lib that combines React 16 Context and immer for Redux semantics_
 -   [robodux](https://github.com/neurosnap/robodux) _flexible way to reduce redux boilerplate_
 -   [immer-reducer](https://github.com/epeli/immer-reducer) _Type-safe and terse Redux reducers with Typescript_
+-   [redux-ts-utils](https://github.com/knpwrs/redux-ts-utils) _Everything you need to create type-safe applications with Redux with a strong emphasis on simplicity_
 -   ... and [many more](https://www.npmjs.com/browse/depended/immer)
 
 ## How does Immer work?