patch 8.1.0209: stderr output from Ruby messes up display

Problem:    Stderr output from Ruby messes up display.
Solution:   Turn the stderr output into a Vim message. (Masataka Pocke
            Kuwabara, closes #3238)
diff --git a/src/version.c b/src/version.c
index e345fed..2db4044 100644
--- a/src/version.c
+++ b/src/version.c
@@ -794,6 +794,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    209,
+/**/
     208,
 /**/
     207,