updated for version 7.3.517
Problem:    Crash when using "vipvv". (Alexandre Provencio)
Solution:   Don't let the text length become negative.
diff --git a/src/version.c b/src/version.c
index 5b4bbfc..0f40176 100644
--- a/src/version.c
+++ b/src/version.c
@@ -715,6 +715,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    517,
+/**/
     516,
 /**/
     515,