Issue #4537: webbrowser.UnixBrowser failed because this module defines an open()
function which shadows the builtin.

Will backport to 3.0
diff --git a/Misc/NEWS b/Misc/NEWS
index d4e749f..15e3401 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -16,6 +16,9 @@
 Library
 -------
 
+- Issue #4537: webbrowser.UnixBrowser would fail to open the browser because
+  it was calling the wrong open() function.
+
 - Issue #1055234: cgi.parse_header(): Fixed parsing of header parameters to
   support unusual filenames (such as those containing semi-colons) in
   Content-Disposition headers.