fast-import: add a get-mark command

diff --git a/RelNotes b/RelNotes
index 695f126692a55f136055470391db5a2d8a91e86e..1addbec92533510e6e368c607deb36e504bbc438 120000 (symlink)
--- a/RelNotes
+++ b/RelNotes
@@ -1 +1 @@
-Documentation/RelNotes/1.7.6.3.txt
\ No newline at end of file
+Documentation/RelNotes/2.4.0.txt
\ No newline at end of file