#25485: Add context manager support to Telnet class.

Patch by Stéphane Wirtel.
diff --git a/Doc/whatsnew/3.6.rst b/Doc/whatsnew/3.6.rst
index 172b253..fc32fb5 100644
--- a/Doc/whatsnew/3.6.rst
+++ b/Doc/whatsnew/3.6.rst
@@ -125,6 +125,13 @@
 an instance were excluded.  (Contributed by Martin Panter in :issue:`25590`.)
 
 
+telnetlib
+---------
+
+:class:`~telnetlib.Telnet` is now a context manager (contributed by
+Stéphane Wirtel in :issue:`25485`).
+
+
 urllib.robotparser
 ------------------