patch 8.0.0301: not enough testing for setting options

Problem:    No tests for ":set completion" and various errors of the :set
            command.
Solution:   Add more :set tests. (Dominique Pelle, closes #1440)

src/version.c

@@ -764,6 +764,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    301,
 /**/
     300,
 /**/