Merge near-duplicate ChangeLog entries

As agreed with Gilles on the PR discussion page
diff --git a/ChangeLog b/ChangeLog
index 626f70d..09b6c99 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -8,8 +8,6 @@
      option if needed.
    * Fixed offset in FALLBACK_SCSV parsing that caused TLS server to fail to
      detect it sometimes. Reported by Hugo Leisink. #810
-   * Tighten ASN.1 parsing of RSA PKCS#1 v1.5 signatures, to avoid a
-     potential Bleichenbacher-style attack.
    * Tighten parsing of RSA PKCS#1 v1.5 signatures, to avoid a
      potential Bleichenbacher/BERserk-style attack.