patch 8.1.0522: :terminal does not show trailing empty lines

Problem:    :terminal does not show trailing empty lines.
Solution:   Add empty lines. (Hirohito Higashi, closes #3605)
diff --git a/src/version.c b/src/version.c
index 8aeda67..1058a2b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -793,6 +793,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    522,
+/**/
     521,
 /**/
     520,