updated for version 7.3.316

Problem:    Crash when 'colorcolumn' is set and closing buffer.
Solution:   Check for w_buffer to be NULL. (Yasuhiro Matsumoto)

src/version.c

@@ -709,6 +709,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    316,
 /**/
     315,
 /**/