patch 8.0.0381: diff mode is not sufficiently tested

Problem:    Diff mode is not sufficiently tested.
Solution:   Add more diff mode tests. (Dominique Pelle, closes #1515)
diff --git a/src/version.c b/src/version.c
index 7408b6d..ccde26d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -765,6 +765,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    381,
+/**/
     380,
 /**/
     379,