Update readme.md

readme.md

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 # Quantum Mechanical Keyboard Firmware
 
+[![Current Version](https://img.shields.io/github/tag/qmk/qmk_firmware.svg)](https://github.com/qmk/qmk_firmware/tags)
 [![Build Status](https://travis-ci.org/qmk/qmk_firmware.svg?branch=master)](https://travis-ci.org/qmk/qmk_firmware)
 [![Gitter](https://img.shields.io/gitter/room/qmk/qmk_firmware.js.svg)](https://gitter.im/qmk/qmk_firmware)
 [![Docs Status](https://img.shields.io/badge/docs-ready-orange.svg)](https://docs.qmk.fm)