faulthandler: add Windows exception handler

Issue #23848: On Windows, faulthandler.enable() now also installs an exception
handler to dump the traceback of all Python threads on any Windows exception,
not only on UNIX signals (SIGSEGV, SIGFPE, SIGABRT).
diff --git a/Doc/whatsnew/3.6.rst b/Doc/whatsnew/3.6.rst
index 986c145..928d748 100644
--- a/Doc/whatsnew/3.6.rst
+++ b/Doc/whatsnew/3.6.rst
@@ -199,6 +199,14 @@
 (Contributed by Ashley Anderson in :issue:`12006`.)
 
 
+faulthandler
+------------
+
+On Windows, the :mod:`faulthandler` module now installs an handler for Windows
+exceptions: see :func:`faulthandler.enable`. (Contributed by Victor Stinner in
+:issue:`23848`.)
+
+
 os
 --