Update README.md

Author: tmcw

README.md

@@ -75,6 +75,7 @@ The `npm run build` command builds a `bundle.js` file that contains all the Java
 * Mapillary uses docbox for [API Documentation](https://www.mapillary.com/developer/api-documentation/) and [Tiles Documentation](https://www.mapillary.com/developer/tiles-documentation/)
 * The open source [Project OSRM](http://project-osrm.org/docs/v5.10.0/api/#general-options) routing engine uses Docbox for its API documentation.
 * [8th Wall](https://docs.8thwall.com/) uses Docbox for the documentation of their AR product
+* [HYCON](https://docs.hycon.io/#introduction) documents their REST API for a blockchain with Docbox
 * _[do you use docbox? let us know!](https://github.com/tmcw/docbox/issues/new?title=I%27m%20using%20docbox!)_
 
 ### [FAQ & See Also](https://github.com/mapbox/docbox/wiki)