Issue #25154: Deprecate the pyvenv script.

This was done so as to move users to `python3 -m venv` which prevents
confusion over which Python interpreter will be used in the virtual
environment when more than one is installed.
diff --git a/Doc/whatsnew/3.6.rst b/Doc/whatsnew/3.6.rst
index b374280..22513cf8 100644
--- a/Doc/whatsnew/3.6.rst
+++ b/Doc/whatsnew/3.6.rst
@@ -197,7 +197,10 @@
 Deprecated features
 -------------------
 
-* None yet.
+* The ``pyvenv`` script has been deprecated in favour of ``python3 -m venv``.
+  This prevents confusion as to what Python interpreter ``pyvenv`` is
+  connected to and thus what Python interpreter will be used by the virtual
+  environment. See :issue:`25154`.
 
 
 Removed