Adapt to changed package of OutputFormat class

Change-Id: Iaecb83c71bb26576bce5cb673c78bb426e526dc9

src/main/java/com/googlesource/gerrit/plugins/auditsl4j/AuditRendererToJson.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/auditsl4j/AuditRendererToJson.java b/src/main/java/com/googlesource/gerrit/plugins/auditsl4j/AuditRendererToJson.java
index 5a21054..3768eb3 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/auditsl4j/AuditRendererToJson.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/auditsl4j/AuditRendererToJson.java
@@ -15,11 +15,11 @@
 package com.googlesource.gerrit.plugins.auditsl4j;
 
 import com.google.common.collect.ListMultimap;
+import com.google.gerrit.json.OutputFormat;
 import com.google.gerrit.reviewdb.client.Account;
 import com.google.gerrit.server.AccessPath;
 import com.google.gerrit.server.AuditEvent;
 import com.google.gerrit.server.CurrentUser;
-import com.google.gerrit.server.OutputFormat;
 import com.google.gson.ExclusionStrategy;
 import com.google.gson.FieldAttributes;
 import com.google.gson.Gson;