Update AUTHORS and added Go Report Card badge

Author: Sergio Andres Virviescas Santana

AUTHORS

@@ -6,4 +6,4 @@
 Gary Burd <gary@beagledreams.com>
 Google LLC (https://opensource.google.com/)
 Joachim Bauch <mail@joachim-bauch.de>
-
+Sergio Andres Virviescas Santana <developersavsgio@gmail.com>

README.md

@@ -6,6 +6,7 @@ Gorilla WebSocket is a [Go](http://golang.org/) implementation of the
 This fork adds [fasthttp](https://github.com/valyala/fasthttp) support with last features and improvments of gorilla/websocket
 
 [![Build Status](https://travis-ci.org/savsgio/websocket.svg?branch=master)](https://travis-ci.org/savsgio/websocket)
+[![Go Report Card](https://goreportcard.com/badge/github.com/fasthttp/websocket)](https://goreportcard.com/report/github.com/fasthttp/websocket)
 [![GoDoc](https://godoc.org/github.com/fasthttp/websocket?status.svg)](https://godoc.org/github.com/fasthttp/websocket)
 
 ### Documentation