patch 8.1.0241: effect of ":tabmove N" is not clear

Problem:    Effect of ":tabmove N" is not clear.
Solution:   Add a test that shows the behavior. (Christian Brabandt,
            closes #3288)
diff --git a/src/version.c b/src/version.c
index c3b7add..6162752 100644
--- a/src/version.c
+++ b/src/version.c
@@ -795,6 +795,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    241,
+/**/
     240,
 /**/
     239,