patch 8.0.0609: some people still don't know how to quit

Problem:    For some people the hint about quitting is not sufficient.
Solution:   Put <Enter> separately.  Also use ":qa!" to get out even when
            there are changes.
diff --git a/src/version.c b/src/version.c
index 70d6201..8c5679e 100644
--- a/src/version.c
+++ b/src/version.c
@@ -765,6 +765,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    609,
+/**/
     608,
 /**/
     607,