updated for version 7.3.518
Problem:    When 'encoding' is a double-byte encoding ":helptags" may not find
            tags correctly.
Solution:   Use vim_strbyte() instead of vim_strchr(). (Yasuhiro Matsumoto)
diff --git a/src/version.c b/src/version.c
index 0f40176..b05c843 100644
--- a/src/version.c
+++ b/src/version.c
@@ -715,6 +715,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    518,
+/**/
     517,
 /**/
     516,