Remove redundant "__future__:" from module docstring.
diff --git a/Lib/__future__.py b/Lib/__future__.py
index beb0b28..de37336 100644
--- a/Lib/__future__.py
+++ b/Lib/__future__.py
@@ -1,4 +1,4 @@
-"""__future__:  Record of phased-in incompatible language changes.
+"""Record of phased-in incompatible language changes.
 
 Each line is of the form: