- fix travis link.

Readme.md

@@ -5,7 +5,7 @@ Open Asset Import Library is a Open Source library designed to load various __3d
 
 Its abbreviated name under which it is commonly known is __assimp__. 
 
-This is the development trunk of assimp containing the latest features and bugfixes. For productive use though, we recommend one of the stable releases available from [assimp.sf.net](http://assimp.sf.net) or from *nix package repositories. According to [Travis-CI] (https://travis-ci.org/), the current build status of the trunk is ![Travis-CI Result](https://api.travis-ci.org/assimp/assimp.png) 
+This is the development trunk of assimp containing the latest features and bugfixes. For productive use though, we recommend one of the stable releases available from [assimp.sf.net](http://assimp.sf.net) or from *nix package repositories. According to [Travis-CI] (https://travis-ci.org/), the current build status of the trunk is [![Build Status](https://travis-ci.org/assimp/assimp.png)](https://travis-ci.org/assimp/assimp)
 
 
 #### 1.1 Supported file formats ####