fix docstring param type [#27]

dnl-blkv · dnl-blkv · commit 6186fa003ec4 · 2017-09-23T16:24:10.000+02:00
diff --git a/bunq/sdk/json/converter.py b/bunq/sdk/json/converter.py
@@ -605,7 +605,7 @@ def types(self):
 
 def set_initializer(initializer):
     """
-    :type initializer: callable
+    :type initializer: Generator[bool, None, None]
     """
 
     JsonAdapter.set_initializer(initializer)
