added link to universal counter example

Author: khtdr

README.md

@@ -102,6 +102,8 @@ These async and [universal (aka “isomorphic”)](https://medium.com/@mjackson/
 * [redux-react-router-async-example](https://github.com/emmenko/redux-react-router-async-example): Work in progress. Semi-official. Only the client side. Uses React Router.
 * [react-redux-universal-hot-example](https://github.com/erikras/react-redux-universal-hot-example): Universal. Uses React Router.
 * [redux-example](https://github.com/quangbuule/redux-example): Universal. Uses Immutable, React Router.
+* [redux-example](https://github.com/quangbuule/redux-example): Universal. Uses Immutable, React Router.
+* [isomorphic-counter-example](https://github.com/khtdr/redux-react-koa-isomorphic-counter-example): Universal. A bare-bone implentation of the [counter example app](https://github.com/gaearon/redux/tree/master/examples/counter). Uses promises-middleware to interact with API via Koa on the server.
 
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