patch 9.0.0320: command line type of CmdlineChange differs from getcmdtype()

Problem:    Command line type of CmdlineChange differs from getcmdtype().
Solution:   Use the same type. (closes #11005)
diff --git a/src/version.c b/src/version.c
index f743bb9..121da62 100644
--- a/src/version.c
+++ b/src/version.c
@@ -708,6 +708,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    320,
+/**/
     319,
 /**/
     318,