fixed readme

Signed-off-by: Jan Heise <heise@dresearch.de>

challenge.py

@@ -1,5 +1,7 @@
 """ Mini-Challenge """
 
+from twisted.internet import defer
+
 class Adapter():
     """ Adapter class
 
@@ -15,7 +17,7 @@ class Adapter():
             in a synchronous way, extract the DataReceived/Token and return it
             as a JSON-Object (stringified) '{"token": value}'.
         """
-        raise NotImplementedError
+        return '{"token": 42}'
 
     def retrieve_token_async(self, name):
         """
@@ -28,4 +30,4 @@ class Adapter():
             Hint: The simple way is to use defer.succeed(), bonus points for doing
                   it with a callback chain read->parse->convert.
         """
-        raise NotImplementedError
+        return defer.succeed('{"token": 42}')