patch 8.2.0899: assert_equalfile() does not give a hint about the difference

Problem:    Assert_equalfile() does not give a hint about the difference.
Solution:   Display the last seen text.
diff --git a/src/version.c b/src/version.c
index ce8bbf1..462e772 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    899,
+/**/
     898,
 /**/
     897,