Update copyright year
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Through
gsed -i -e 's+2018-2021+2018-2022+g' *.ipynb
gsed -i -e 's+2018-2021+2018-2022+g' */*.ipynb
gsed -i -e 's+2018-2021+2018-2022+g' */*/*.ipynb
(gsed in macOS to use the GNU version which correctly handles the inplace option - on Linux just sed is ok).