📝 Add link to hodmin cli-client (#19)

README.md

@@ -14,6 +14,7 @@ You can find an implementation of the Homie convention:
 * ![WIP](https://cdn2.iconfinder.com/data/icons/thesquid-ink-40-free-flat-icon-pack/64/barricade-24.png) **WIP** - An opinionated Web UI built with Node.js: [marvinroger/homie-server](https://github.com/marvinroger/homie-server)
 * ![WIP](https://cdn2.iconfinder.com/data/icons/thesquid-ink-40-free-flat-icon-pack/64/barricade-24.png) **WIP** - Some Node-RED nodes for automation: [marvinroger/node-red-contrib-homie](https://github.com/marvinroger/node-red-contrib-homie)
 * A Python-implementation for Raspberry Pi & Co.: [jalmeroth/homie-python](https://github.com/jalmeroth/homie-python).
+* A Ruby-implementation including a command-line-client with OTA-Support for easy adminstration of multiple Homie-devices: [rttools/hodmin](https://github.com/rttools/hodmin)
 
 ## Background