patch 9.0.0089: fuzzy argument completion doesn't work for shell commands

Problem:    Fuzzy argument completion doesn't work for shell commands.
Solution:   Check for cmdidx not being CMD_bang. (Yegappan Lakshmanan,
            closes #10769)
diff --git a/src/version.c b/src/version.c
index 7c58424..74fb0e1 100644
--- a/src/version.c
+++ b/src/version.c
@@ -736,6 +736,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    89,
+/**/
     88,
 /**/
     87,