changed badge to github

src/site/site.xml

@@ -113,7 +113,7 @@
 				<a href="https://build.se.informatik.uni-kiel.de/jenkins/view/TeeTime/job/teetime-nightly-release/lastCompletedBuild/testReport/"><img alt="Jenkins build status" src="https://img.shields.io/jenkins/t/https/build.se.informatik.uni-kiel.de/jenkins/view/TeeTime/teetime-nightly-release.svg?style=flat-square"></a>
 				<br /><br />Stable state:
 				<br />
-				<a href="https://sourceforge.net/projects/teetime/files/latest/download" rel="nofollow"><img alt="Download TeeTime" src="https://img.shields.io/sourceforge/dt/teetime.svg?style=flat-square"></a>
+				<a href="https://github.com/teetime-framework/teetime/releases/latest" rel="nofollow"><img alt="Download TeeTime" src="https://img.shields.io/github/downloads/teetime-framework/teetime/latest/total.svg?style=flat-square"></a>
 				<br />
 				<a href="http://search.maven.org/#search%7Cgav%7C1%7Cg%3A%22net.sourceforge.teetime%22%20AND%20a%3A%22teetime%22"><img alt="Download TeeTime" src="https://img.shields.io/maven-central/v/net.sourceforge.teetime/teetime.svg?style=flat-square"></a>
 				]]>