updated for version 7.4.104

Problem:    ":help s/\_" reports an internal error. (John Beckett)
Solution:   Check for NUL and invalid character classes.

src/version.c

@@ -738,6 +738,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    104,
 /**/
     103,
 /**/