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

diff --git a/RelNotes b/RelNotes
index dd8bc4bb4ab75e1148cb9b7aaf8ff7384ebb19ec..5c6b14b69463249efe973dca73d81feecb352460 120000 (symlink)
--- a/RelNotes
+++ b/RelNotes
@@ -1 +1 @@
-Documentation/RelNotes-1.6.3.txt
\ No newline at end of file
+Documentation/RelNotes/1.7.8.4.txt
\ No newline at end of file