maint: post-release administrivia

* NEWS: Add header line for next release.
diff --git a/NEWS b/NEWS
index 373d36f..33e0ba1 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,6 @@
+Noteworthy changes in release ?.? (????-??-??)
+==============================================
+
 Noteworthy changes in release 4.9 (2014-08-15)
 ==============================================