fast-import: add a get-mark command

diff --git a/RelNotes b/RelNotes
index bcb4fb98ff925389797125283e40c6e397efc1fd..1addbec92533510e6e368c607deb36e504bbc438 120000 (symlink)
--- a/RelNotes
+++ b/RelNotes
@@ -1 +1 @@
-Documentation/RelNotes/1.7.11.txt
\ No newline at end of file
+Documentation/RelNotes/2.4.0.txt
\ No newline at end of file