update license year to 2020

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迷渡 2020-01-15 15:00:54 +08:00 committed by GitHub
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commit aba3386436
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@ -1,4 +1,4 @@
Copyright 2014-2019 The Rust Project Developers
Copyright 2014-2020 The Rust Project Developers
Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
http://www.apache.org/licenses/LICENSE-2.0> or the MIT license