Fixed license header
diff --git a/core/src/main/java/org/apache/metamodel/membrane/app/config/JacksonConfig.java b/core/src/main/java/org/apache/metamodel/membrane/app/config/JacksonConfig.java
index 8021541..a9ad0cd 100644
--- a/core/src/main/java/org/apache/metamodel/membrane/app/config/JacksonConfig.java
+++ b/core/src/main/java/org/apache/metamodel/membrane/app/config/JacksonConfig.java
@@ -1,3 +1,21 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
package org.apache.metamodel.membrane.app.config;
import org.apache.metamodel.membrane.swagger.invoker.JSON;
