README: add gocover.io badge
diff --git a/README.md b/README.md
index bf4dcdd..ddf3cf0 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# HttpRouter [](https://travis-ci.org/julienschmidt/httprouter) [](http://godoc.org/github.com/julienschmidt/httprouter)
+# HttpRouter [](https://travis-ci.org/julienschmidt/httprouter) [](http://gocover.io/github.com/julienschmidt/httprouter) [](http://godoc.org/github.com/julienschmidt/httprouter)
HttpRouter is a lightweight high performance HTTP request router
(also called *multiplexer* or just *mux* for short) for [Go](http://golang.org/).