Add XmlStringLookupTest.testInterpolatorSecureOnBla()

Author: garydgregory

src/test/resources/org/apache/commons/text/bla.xml

@@ -1,4 +1,20 @@
 <?xml version="1.0"?>
+<!--
+     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
+
+          https://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.
+  -->
 <!DOCTYPE lolz [
  <!ENTITY lol "lol">
  <!ELEMENT lolz (#PCDATA)>