update Changelogv2.4.5OPENBSD_6_0

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@@ -28,6 +28,19 @@ history is also available from Git.
 
 LibreSSL Portable Release Notes:
 
+2.4.5  - Security and compatibility fixes
+
+        * Avoid a side-channel cache-timing attack that can leak the ECDSA
+          private keys when signing. This is due to BN_mod_inverse() being
+          used without the constant time flag being set.
+
+          This issue was reported by Cesar Pereida Garcia and Billy Brumley
+          (Tampere University of Technology). The fix was developed by Cesar
+          Pereida Garcia.
+
+        * iOS and MacOS compatibility updates from Simone Basso and Jacob
+          Berkman.
+
 2.4.4 - Reliability improvements
 
         * Avoid continual processing of an unlimited number of TLS records,