fix($readme): add note about trying query/search feature in @next dis…

…t-tag

README.md

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   <img alt="Edit Redux-First Router Demo" src="https://codesandbox.io/static/img/play-codesandbox.svg">
 </a>
 
+> UPDATE: as of July 17th, query/search support is available. Please try it out via `yarn upgrade redux-first-router@next`. And review [this comment](https://github.com/faceyspacey/redux-first-router/issues/17#issuecomment-315957332) for a usage example.
+
 # Redux-First Router [![Gitter](https://img.shields.io/gitter/room/nwjs/nw.js.svg?style=flat-square)](https://gitter.im/redux-first-router/Lobby)
 
 <p align="center">