Add cmd for license checker (#252)

* Add cmd for license checker

* Fix licence checker failure

.licenserc.yaml

@@ -20,6 +20,7 @@ header:
 
  paths:
  - 'pkg/'
+ - 'cmd/'
 
  paths-ignore:
  - '**/*.json'
@@ -45,4 +46,4 @@ header:
 
 dependency:
  files:
- - go.mod
+ - go.mod

cmd/client/command/visitor.go

@@ -1,3 +1,20 @@
+/*
+ * Copyright (c) 2017, MegaEase
+ * All rights reserved.
+ *
+ * Licensed 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: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.
+ */
+
 package command
 
 import (