blame: handle --first-parent

diff --git a/RelNotes b/RelNotes
index 2bff7b20de8972e2a8cf9bf7a8cea4ff2e9789f1..24f83fe617943898ecbd47f3d3c2ef9968a54388 120000 (symlink)
--- a/RelNotes
+++ b/RelNotes
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-Documentation/RelNotes/1.9.4.txt
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+Documentation/RelNotes/2.5.2.txt
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