updated for version 7.4.165
Problem:    By default, after closing a buffer changes can't be undone.
Solution:   In the example vimrc file set 'undofile'.
diff --git a/src/version.c b/src/version.c
index 312653e..821feb9 100644
--- a/src/version.c
+++ b/src/version.c
@@ -739,6 +739,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    165,
+/**/
     164,
 /**/
     163,