Revert "Update Makefile license description"

This reverts commit b736078e3c.

Makefile

@@ -1,16 +1,6 @@
 # Copyright 2018 The KubeSphere Authors. 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://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.
+# Use of this source code is governed by a Apache license
+# that can be found in the LICENSE file.
 
 # The binary to build 
 BIN ?= ks-apiserver
@@ -25,6 +15,7 @@ else
 GOBIN=$(shell go env GOBIN)
 endif
 
+
 IMG ?= kubespheredev/ks-apiserver
 OUTPUT_DIR=bin
 GOFLAGS=-mod=vendor