Badges added to README.md file.

Author: martignoni

README.md

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 # MoodleBox Moodle plugin
 
 [![Build Status](https://travis-ci.org/martignoni/moodle-tool_moodlebox.svg?branch=master)](https://travis-ci.org/martignoni/moodle-tool_moodlebox)
+[![GitHub release](https://img.shields.io/github/release/martignoni/moodle-tool_moodlebox.svg)](https://github.com/martignoni/moodle-tool_moodlebox/releases/latest)
+[![GitHub Release Date](https://img.shields.io/github/release-date/martignoni/moodle-tool_moodlebox.svg)](https://github.com/martignoni/moodle-tool_moodlebox/releases/latest)
+[![GitHub last commit](https://img.shields.io/github/last-commit/martignoni/moodle-tool_moodlebox.svg)](https://github.com/martignoni/moodlebox/commits/)
+
 
 A Moodle administration plugin providing a GUI to some settings and management of a [MoodleBox](https://moodlebox.net/), a Moodle server installed on a [Raspberry Pi](http://www.raspberrypi.org/).