Update README: travis badge link

README.adoc

@@ -1,4 +1,4 @@
-image:https://travis-ci.org/davidB/sandbox_wiki_jme.svg?branch=master["Build Status", link="https://travis-ci.org/davidB/sandbox_wiki_jme"]
+image:https://travis-ci.org/jMonkeyEngine/wiki.svg?branch=master["Build Status", link="https://travis-ci.org/jMonkeyEngine/wiki"]
 
 = jMonkeyEngine Documentation