patch 9.0.1206: testing with Python on AppVeyor does not work properly

Problem:    Testing with Python on AppVeyor does not work properly.
Solution:   Fix typo.  Move most lines to the .bat file. (Christopher
            Plewright, closes #11828)
diff --git a/src/version.c b/src/version.c
index 6baed86..7825984 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1206,
+/**/
     1205,
 /**/
     1204,