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

diff --git a/RelNotes b/RelNotes
index 3dad2389f600053e534a75563049a66b5bdb1ebf..d69b2c37acc38f4916d4daa8387abb567a8b9834 120000 (symlink)
--- a/RelNotes
+++ b/RelNotes
@@ -1 +1 @@
-Documentation/RelNotes/1.6.6.3.txt
\ No newline at end of file
+Documentation/RelNotes/1.7.9.1.txt
\ No newline at end of file