update copyright year to 2021

publiccodenet / smart-cities-public-code

The «Smart Cities? Public Code!» programme by the University of Applied Sciences Amsterdam, City of Amsterdam and the Foundation for Public Code.

https://smartcities.publiccode.net

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Closed ElenaFdR closed 3 years ago

ElenaFdR commented 3 years ago

It's not 2018 anymore. This will also nudge the repo to pull in new changes to the footer (Jekyll theme PR 68).