patch 8.0.0929: :term without argument does not work

Problem:    :term without argument does not work.
Solution:   Use shell for empty command. (Yasuhiro Matsumoto, closes #1970)
diff --git a/src/version.c b/src/version.c
index fc4b858..cc7bb86 100644
--- a/src/version.c
+++ b/src/version.c
@@ -770,6 +770,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    929,
+/**/
     928,
 /**/
     927,