Deprecate bsddb for removal in Python 3.0.

Closes issue 3776.
Review by Nick Coghlan.
diff --git a/Misc/NEWS b/Misc/NEWS
index dd703ee..8c24653 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -56,6 +56,8 @@
 Library
 -------
 
+- Issue 3776: Deprecate the bsddb package for removal in 3.0.
+
 - Issue #3762: platform.architecture() fails if python is lanched via
   its symbolic link.