Upgrading server dependancies (#6431)

vendor/github.com/gorilla/handlers/README.md

@@ -1,6 +1,8 @@
 gorilla/handlers
 ================
 [![GoDoc](https://godoc.org/github.com/gorilla/handlers?status.svg)](https://godoc.org/github.com/gorilla/handlers) [![Build Status](https://travis-ci.org/gorilla/handlers.svg?branch=master)](https://travis-ci.org/gorilla/handlers)
+[![Sourcegraph](https://sourcegraph.com/github.com/gorilla/handlers/-/badge.svg)](https://sourcegraph.com/github.com/gorilla/handlers?badge)
+
 
 Package handlers is a collection of handlers (aka "HTTP middleware") for use
 with Go's `net/http` package (or any framework supporting `http.Handler`), including: