patch 8.0.0817: cannot get the terminal line at the cursor

Problem:    Cannot get the line of a terminal window at the cursor.
Solution:   Make the row argunt optionsl. (Yasuhiro Matsumoto, closes #1898)
diff --git a/src/version.c b/src/version.c
index f601bfd..21cd3e2 100644
--- a/src/version.c
+++ b/src/version.c
@@ -770,6 +770,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    817,
+/**/
     816,
 /**/
     815,