Update copyright year

LICENSE-MIT

@@ -1,4 +1,4 @@
-Copyright (c) 2018-2020 bat-developers (https://github.com/sharkdp/bat).
+Copyright (c) 2018-2021 bat-developers (https://github.com/sharkdp/bat).
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

README.md

@@ -727,7 +727,7 @@ There are a lot of alternatives, if you are looking for similar programs. See
 [this document](doc/alternatives.md) for a comparison.
 
 ## License
-Copyright (c) 2018-2020 [bat-developers](https://github.com/sharkdp/bat).
+Copyright (c) 2018-2021 [bat-developers](https://github.com/sharkdp/bat).
 
 `bat` is made available under the terms of either the MIT License or the Apache License 2.0, at your option.
 

doc/README-ja.md

@@ -630,7 +630,7 @@ cargo install --locked --force
 比較については [このドキュメント](alternatives.md) を参照してください。
 
 ## ライセンス
-Copyright (c) 2018-2020 [bat-developers](https://github.com/sharkdp/bat).
+Copyright (c) 2018-2021 [bat-developers](https://github.com/sharkdp/bat).
 
 `bat` は MIT License 及び Apache License 2.0 の両方の条件の下で配布されています。
 

doc/README-ko.md

@@ -553,7 +553,7 @@ cargo install --locked --force
 비슷한 프로그램들을 찾고 있다면, 많은 대안들이 있습니다. 비교는 [이 문서]((doc/alternatives.md))를 참조해주세요. 
 
 ## 라이센스
-Copyright (c) 2018-2020 [bat-developers](https://github.com/sharkdp/bat).
+Copyright (c) 2018-2021 [bat-developers](https://github.com/sharkdp/bat).
 
 `bat`는 MIT 라이센스 및 Apache 라이센스 2.0의 조건에 따라 배포됩니다.  
 

doc/README-ru.md

@@ -587,7 +587,7 @@ cargo install --locked --force
 Есть очень много альтернатив `bat`. Смотрите [этот документ](doc/alternatives.md) для сравнения.
 
 ## Лицензия
-Copyright (c) 2018-2020 [Разработчики bat](https://github.com/sharkdp/bat).
+Copyright (c) 2018-2021 [Разработчики bat](https://github.com/sharkdp/bat).
 
 `bat` распостраняется под лицензями MIT License и Apache License 2.0 (на выбор пользователя).