Two badges and license file renaming

Author: newpavlov

license.txt renamed to LICENSE.txt

@@ -1,4 +1,4 @@
-# hidapi [![Build Status](https://travis-ci.org/Osspial/hidapi-rs.svg?branch=master)](https://travis-ci.org/Osspial/hidapi-rs) [![Version](https://img.shields.io/crates/v/hidapi.svg)](https://crates.io/crates/hidapi)
+# hidapi [![Build Status](https://travis-ci.org/Osspial/hidapi-rs.svg?branch=master)](https://travis-ci.org/Osspial/hidapi-rs) [![Version](https://img.shields.io/crates/v/hidapi.svg)](https://crates.io/crates/hidapi) [![License: LGPL v3](https://img.shields.io/badge/License-LGPL%20v3-blue.svg)](https://github.com/Osspial/hidapi-rs/blob/master/LICENSE.txt) [![Documentation](https://img.shields.io/badge/docs-online-2020ff.svg)](http://wombat.platymuus.com/rustdoc/discord_master/)
 
 This crate provides a rust abstraction over the features of the C library
 [hidapi](https://github.com/signal11/hidapi) by signal11. Based off of