patch 8.0.0868: cannot specify the terminal size on the command line

Problem:    Cannot specify the terminal size on the command line.
Solution:   Use the address range for the terminal size. (Yasuhiro Matsumoto,
            closes #1941)
diff --git a/src/version.c b/src/version.c
index d3b3215..a721d42 100644
--- a/src/version.c
+++ b/src/version.c
@@ -770,6 +770,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    868,
+/**/
     867,
 /**/
     866,