Change license to Apache 2.
Also remove explicit PATENTS file. The new LICENSE file already
discusses patents.
Note that the Puffs project has not yet been publicly released.
diff --git a/script/print-bits.go b/script/print-bits.go
index 0171abd..b09eef1 100644
--- a/script/print-bits.go
+++ b/script/print-bits.go
@@ -1,5 +1,16 @@
-// Use of this source code is governed by a BSD-style license that can be found
-// in the LICENSE file.
+// Copyright 2017 The Puffs Authors.
+//
+// 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
+//
+// 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.
// +build ignore