fix

README.md

@@ -44,7 +44,7 @@ See also http://arewewebyet.com/
   * client
     * [carllerche/curl-rust](https://github.com/carllerche/curl-rust) — [libcurl](http://curl.haxx.se/libcurl/) bindings
   * server
-    * [erickt/rust-mongrel2](https://github.com/erickt/rust-mongrel2) — [Mongrel2](http://mongrel2.org) bindings [<img src="https://travis-ci.org/erickt/rust-mongrel2?branch=master">](https://travis-ci.org/erickt/rust-mongrel2)
+    * [erickt/rust-mongrel2](https://github.com/erickt/rust-mongrel2) — [Mongrel2](http://mongrel2.org) bindings [<img src="https://travis-ci.org/erickt/rust-mongrel2.png?branch=master">](https://travis-ci.org/erickt/rust-mongrel2)
     * [Iron](http://ironframework.io/) — inspired by [Express](http://expressjs.com/). [<img src="https://travis-ci.org/iron/iron.png?branch=master">](https://travis-ci.org/iron/iron)
     * [Nickel](http://nickel.rs/) — inspired by [Express](http://expressjs.com/).