patch 8.2.0531: various errors not tested

Problem:    Various errors not tested.
Solution:   Add tests. (Yegappan Lakshmanan, closes #5895)
diff --git a/src/version.c b/src/version.c
index 2caae75..63f811c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -739,6 +739,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    531,
+/**/
     530,
 /**/
     529,