updated for version 7.3.931

Problem:    No completion for :xmap and :smap. (Yukihiro Nakadaira)
Solution:   Add the case statements. (Christian Brabandt)

src/version.c

@@ -728,6 +728,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    931,
 /**/
     930,
 /**/