foodforus: move api_key to end of signature

modules/foodforus.py

@@ -14,11 +14,12 @@ API_URL = 'http://foodfor.vtluug.org'
 
 
 def _sign_vote(api_key, args):
-    data = "ffu0" + api_key
+    data = "ffu1"
     for k, v in sorted(args.items()):
         if k == 'sig':
             continue
         data += '{0}{1}'.format(k, v)
+    data += api_key
     h = hashlib.sha256()
     h.update(data.encode('utf-8'))
     return h.hexdigest()