Update makefile header license description

Makefile

@@ -1,6 +1,14 @@
 # Copyright 2018 The KubeSphere Authors. All rights reserved.
-# Use of this source code is governed by a Apache license
-# that can be found in the LICENSE file.
+#
+# Licensed under the Apache License, Version 2.0 (the "License").
+# You may not use this file except in compliance with the License 
+# described in the file LICENSE.
+#
+# 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.
 
 # The binary to build 
 BIN ?= ks-apiserver