pickaxe: allow -i to search in patch case-insensitively

diff --git a/RelNotes b/RelNotes
index 115c33553bb99a5ac6c21c2ac0f33ab7b48a4901..5c6b14b69463249efe973dca73d81feecb352460 120000 (symlink)
--- a/RelNotes
+++ b/RelNotes
@@ -1 +1 @@
-Documentation/RelNotes-1.6.5.6.txt
\ No newline at end of file
+Documentation/RelNotes/1.7.8.4.txt
\ No newline at end of file