updated for version 7.3.1217

Problem:    New regexp engine: Can't handle \%[[ao]]. (Yukihiro Nakadaira)
Solution:   Support nested atoms inside \%[].

src/version.c

@@ -728,6 +728,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1217,
 /**/
     1216,
 /**/