Fix mistake according comment

test/integrate/dubbo/go-client/Dockerfile

-FROM golang
+#
+#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.
+#
 
-MAINTAINER scottwangsxll@gmail.com
+FROM golang
 
 WORKDIR /go/src/github.com/apache/dubbo-go/test/integrate/dubbo/go-client
 

test/integrate/dubbo/go-client/go.mod

 module github.com/apache/dubbo-go/test/integrate/dubbo/go-client
 
-go 1.14
+go 1.13

test/integrate/dubbo/go-server/Dockerfile

-FROM golang
+#
+#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.
+#
 
-MAINTAINER scottwangsxll@gmail.com
+FROM golang
 
 WORKDIR /go/src/github.com/apache/dubbo-go/test/integrate/dubbo/go-server
 

test/integrate/dubbo/go-server/go.mod

 module github.com/apache/dubbo-go/test/integrate/dubbo/go-server
 
-go 1.14
+go 1.13