patch 8.1.1841: no test for Ex shift commands

Problem:    No test for Ex shift commands.
Solution:   Add a test. (Dominique Pelle, closes #4801)
diff --git a/src/version.c b/src/version.c
index 8e79926..5e40a1f 100644
--- a/src/version.c
+++ b/src/version.c
@@ -770,6 +770,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1841,
+/**/
     1840,
 /**/
     1839,