patch 8.2.0004: get E685 and E931 if buffer reload is interrupted

Problem:    Get E685 and E931 if buffer reload is interrupted.
Solution:   Do not abort deleting a dummy buffer. (closes #5361)
diff --git a/src/version.c b/src/version.c
index 19eaf45..c979eeb 100644
--- a/src/version.c
+++ b/src/version.c
@@ -743,6 +743,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4,
+/**/
     3,
 /**/
     2,