[derp] remove comma

Author: Cam Pedersen

package.json

@@ -2,7 +2,7 @@
   "author": "Cam Pedersen <diffference@gmail.com> (http://campedersen.com/)",
   "contributors": [
     { "name": "Rick Waldron", "email": "waldron.rick@gmail.com" },
-    { "name": "Leonhardt Wille", "email": "wille@riverlabs.de" },
+    { "name": "Leonhardt Wille", "email": "wille@riverlabs.de" }
   ],
   "name": "duino",
   "description": "Arduino framework for mad scientists",