port simplejson upgrade from the trunk #4136

json also now works only with unicode strings

Patch by Antoine Pitrou; updated by me
diff --git a/Misc/NEWS b/Misc/NEWS
index 40467b0..7f22b0d 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -107,6 +107,8 @@
 Library
 -------
 
+- The json module now works exclusively with str and not bytes.
+
 - Issue #3959: The ipaddr module has been added to the standard library.
   Contributed by Google.