updated for version 7.3.560
Problem:    Get an error for a locked argument in extend().
Solution:   Initialize the lock flag for a dictionary. (Yukihiro Nakadaira)
diff --git a/src/version.c b/src/version.c
index 2f09e4be..23049a8 100644
--- a/src/version.c
+++ b/src/version.c
@@ -715,6 +715,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    560,
+/**/
     559,
 /**/
     558,