Add ASF header in release-validate.sh script
diff --git a/committer-tools/release-validate.sh b/committer-tools/release-validate.sh
index 1aba736..1546ded 100755
--- a/committer-tools/release-validate.sh
+++ b/committer-tools/release-validate.sh
@@ -1,4 +1,20 @@
#!/bin/bash
+#
+# 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.
+#
export MVN_REPO=https://repo1.maven.org/maven2
