Add missing @Override to SSHLog.toAuditLog

Change-Id: Ic12cd835b85bed57b99703458b6cddd55f46c7b4
diff --git a/src/main/java/com/googlesource/gerrit/plugins/auditsl4j/logsource/SSHLog.java b/src/main/java/com/googlesource/gerrit/plugins/auditsl4j/logsource/SSHLog.java
index 03d9bed..daf3c1d 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/auditsl4j/logsource/SSHLog.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/auditsl4j/logsource/SSHLog.java
@@ -149,6 +149,7 @@
     return Optional.empty();
   }
 
+  @Override
   public Optional<String> toAuditLog(LoggerAudit loggerAudit) {
     return getWhen()
         .map(