patch 8.2.0551: not all code for options is tested

Problem:    Not all code for options is tested.
Solution:   Add more tests. (Yegappan Lakshmanan, closes #5913)
diff --git a/src/version.c b/src/version.c
index 3ebee92..4959ab7 100644
--- a/src/version.c
+++ b/src/version.c
@@ -739,6 +739,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    551,
+/**/
     550,
 /**/
     549,