diff --stat: add config option to limit graph width

diff --git a/RelNotes b/RelNotes
index 141fc91ef109e4fe17be8ddc4a2c2272d6a378ec..d69b2c37acc38f4916d4daa8387abb567a8b9834 120000 (symlink)
--- a/RelNotes
+++ b/RelNotes
@@ -1 +1 @@
-Documentation/RelNotes/1.7.7.2.txt
\ No newline at end of file
+Documentation/RelNotes/1.7.9.1.txt
\ No newline at end of file