blame: handle --first-parent

diff --git a/RelNotes b/RelNotes
index 13a018df3adc2e8f192700397eeea4588c0c29b3..24f83fe617943898ecbd47f3d3c2ef9968a54388 120000 (symlink)
--- a/RelNotes
+++ b/RelNotes
@@ -1 +1 @@
-Documentation/RelNotes/1.8.4.3.txt
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+Documentation/RelNotes/2.5.2.txt
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