patch 8.0.1418: no test for expanding backticks

Problem:    No test for expanding backticks.
Solution:   Add a test. (Dominique Pelle, closes #2479)
diff --git a/src/version.c b/src/version.c
index 2ab6aac..9f034d7 100644
--- a/src/version.c
+++ b/src/version.c
@@ -772,6 +772,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1418,
+/**/
     1417,
 /**/
     1416,