Update ChangeLog

Signed-off-by: Elena Uziunaite <elena.uziunaite@arm.com>
diff --git a/ChangeLog.d/fix_reporting_of_key_usage_issues.txt b/ChangeLog.d/fix_reporting_of_key_usage_issues.txt
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+++ b/ChangeLog.d/fix_reporting_of_key_usage_issues.txt
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+Bugfix
+   * Fix the failure to correctly update verification flags when
+   checking the (ext)KeyUsage extension.
+   Resolves #1260