Changes Copyright information from
SPDX-FileCopyrightText: x - x The Atlite Authors
to
SPDX-FileCopyrightText: Contributors to Atlite <https://github.com/pypsa/atlite>
According to REUSE docs we don't need to add a year. Since the yearly update is quite often forgotten and therefore not up to date, I would remove it for better maintenence.
"Contributers to xx" is also the recommended as Copyright Symbol in the REUSE docs for such projects
SPDX-FileCopyrightText: x - x The Atlite AuthorstoSPDX-FileCopyrightText: Contributors to Atlite <https://github.com/pypsa/atlite>