PEP 3114: rename .next() to .__next__() and add next() builtin.
diff --git a/Lib/wsgiref/util.py b/Lib/wsgiref/util.py
index 450a32f..5b44eda 100644
--- a/Lib/wsgiref/util.py
+++ b/Lib/wsgiref/util.py
@@ -26,7 +26,7 @@
     def __iter__(self):
         return self
 
-    def next(self):
+    def __next__(self):
         data = self.filelike.read(self.blksize)
         if data:
             return data