Add ChangeLog entry

Signed-off-by: Janos Follath <janos.follath@arm.com>
diff --git a/ChangeLog.d/reject-low-order-points-early.txt b/ChangeLog.d/reject-low-order-points-early.txt
new file mode 100644
index 0000000..eb73569
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+++ b/ChangeLog.d/reject-low-order-points-early.txt
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+Security
+   * An adversary with access to precise enough timing information (typically, a
+     co-located process) could recover a Curve25519 or Curve448 static ECDH key
+     after inputting a chosen public key and observing the victim performing the
+     corresponding private-key operation. Found and reported by Leila Batina,
+     Lukas Chmielewski, Björn Haase, Niels Samwel and Peter Schwabe.