add subhead for 1.6.0 release

rouilj · rouilj · commit 81cc0d9aef4f · 2018-07-12T20:54:40.000-04:00
diff --git a/doc/acknowledgements.txt b/doc/acknowledgements.txt
@@ -14,6 +14,8 @@ ideas and everything else that helped!
 1.6
 ---
 
+1.6.0
+~~~~~
 Maintainer: Ralf Schlatterbeck, John Rouillard
 
 Release Manager: John Rouillard
