patch 8.0.1597: autocommand events are not sorted

Problem:    Autocommand events are not sorted.
Solution:   Sort the autocommand events.
diff --git a/src/version.c b/src/version.c
index a6ca132..e30c251 100644
--- a/src/version.c
+++ b/src/version.c
@@ -767,6 +767,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1597,
+/**/
     1596,
 /**/
     1595,