Have the sha module raise a DeprecationWarning as specified in PEP 4.
diff --git a/Misc/NEWS b/Misc/NEWS
index c1f3763..740602b 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -220,6 +220,8 @@
 Library
 -------
 
+- sha now raises a DeprecationWarning upon import.
+
 - md5 now raises a DeprecationWarning upon import.
 
 - mimify now raises a DeprecationWarning upon import.