updated for version 7.3.683

Problem:    ":python" may crash when vimbindeval() returns None.
Solution:   Check for v_string to be NULL. (Yukihiro Nakadaira)

src/version.c

@@ -719,6 +719,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    683,
 /**/
     682,
 /**/