add jan to authors

appinfo/app.json

@@ -12,6 +12,10 @@
         {
             "name": "Alessandro Cosentino",
             "email": "cosenal@gmail.com"
+        },
+        {
+            "name": "Jan-Christoph Borchardt",
+            "email": "hey@jancborchardt.net"
         }
     ],
     "homepage": "https://github.com/owncloud/news",