patch 9.0.0567: 'completeopt' "longest" is not used for complete()

Problem:    'completeopt' "longest" is not used for complete().
Solution:   Also use "longest" for complete(). (Bjorn Linse, closes #11206)
diff --git a/src/version.c b/src/version.c
index 26eada3..bf58a7a 100644
--- a/src/version.c
+++ b/src/version.c
@@ -700,6 +700,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    567,
+/**/
     566,
 /**/
     565,