Update LICENSE

Author: blinkov

LICENSE

@@ -1,4 +1,4 @@
-Copyright 2018-2019 Yandex LLC
+Copyright 2018-2020 Yandex LLC
 Copyright 2017 Pavel Artemkin
 
                                  Apache License
@@ -189,7 +189,7 @@ Copyright 2017 Pavel Artemkin
       same "printed page" as the copyright notice for easier
       identification within third-party archives.
 
-   Copyright 2018-2019 Yandex LLC
+   Copyright 2018-2020 Yandex LLC
    Copyright 2017 Pavel Artemkin