usage: allow pluggable die-recursion checks

diff --git a/RelNotes b/RelNotes
index 39dc075ee01342db1cd11c47f6de0395df605976..4f1d2cb9a91cb4dd41af193c68ab3958f7736d97 120000 (symlink)
--- a/RelNotes
+++ b/RelNotes
@@ -1 +1 @@
-Documentation/RelNotes/1.7.3.5.txt
\ No newline at end of file
+Documentation/RelNotes/1.8.1.6.txt
\ No newline at end of file