Update README.md

README.md

 HD app is the magic tool that allows the Happy Dev network to thrive in a decentralized way.
 
-## Install (Ubuntu)
+## Install
   * `git clone --recurse-submodules https://git.happy-dev.fr/happy-dev/hd-app.git`
   * `cd hd-app`
   * `npm install -g grunt-cli`