patch 9.0.0353: missing entry in switch

Problem:    Missing entry in switch.
Solution:   Add ISN_ECHOWINDOW.
diff --git a/src/version.c b/src/version.c
index e576be3..7d046d0 100644
--- a/src/version.c
+++ b/src/version.c
@@ -708,6 +708,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    353,
+/**/
     352,
 /**/
     351,