Add version and release badges to readme

Author: McGiverGim

README.md

@@ -1,6 +1,6 @@
 # Betaflight TX Lua Scripts
 
- [![Build Status](https://api.travis-ci.com/betaflight/betaflight-tx-lua-scripts.svg?branch=master)](https://travis-ci.com/betaflight/betaflight-tx-lua-scripts) [![Build Status](https://dev.azure.com/Betaflight/Betaflight%20Nightlies/_apis/build/status/betaflight.betaflight-tx-lua-scripts?branchName=master)](https://dev.azure.com/Betaflight/Betaflight%20Nightlies/_build/latest?definitionId=1&branchName=master)
+ [![Latest version](https://img.shields.io/github/v/release/betaflight/betaflight-tx-lua-scripts)](https://github.com/betaflight/betaflight-tx-lua-scripts/releases) [![Build Status](https://api.travis-ci.com/betaflight/betaflight-tx-lua-scripts.svg?branch=master)](https://travis-ci.com/betaflight/betaflight-tx-lua-scripts) [![Build Status](https://dev.azure.com/Betaflight/Betaflight%20Nightlies/_apis/build/status/betaflight.betaflight-tx-lua-scripts?branchName=master)](https://dev.azure.com/Betaflight/Betaflight%20Nightlies/_build/latest?definitionId=1&branchName=master) [![License: GPL v3](https://img.shields.io/badge/License-GPLv3-blue.svg)](https://www.gnu.org/licenses/gpl-3.0)
 
 ## Firmware Considerations