Happy new year (#7814)

* Happy new year

Updates the copyright years and fixes wrong license headers.

* Fix the template

* Split HEADER into HEADER-APACHE & HEADER-GPL

Author: bkchr

src/lib.rs

@@ -1,6 +1,6 @@
 // This file is part of Substrate.
 
-// Copyright (C) 2019-2020 Parity Technologies (UK) Ltd.
+// Copyright (C) 2019-2021 Parity Technologies (UK) Ltd.
 // SPDX-License-Identifier: Apache-2.0
 
 // Licensed under the Apache License, Version 2.0 (the "License");