update license year

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Yihui Xie 2021-11-11 23:13:01 -06:00
parent 8079ad2d63
commit c5236cf022

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@ -1,6 +1,6 @@
The MIT License (MIT) The MIT License (MIT)
Copyright (c) 2017-2020 Yihui Xie Copyright (c) 2017-2021 Yihui Xie
Permission is hereby granted, free of charge, to any person obtaining a copy of Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in this software and associated documentation files (the "Software"), to deal in