Bump docker to 20.04 LTS and remove Python 2 dependencies

Kattis / problemtools

Tools to manage problem packages using the Kattis problem package format.

MIT License

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Bump docker to 20.04 LTS and remove Python 2 dependencies #183

Closed pehrsoderman closed 3 years ago

pehrsoderman commented 3 years ago

Python 2 dependencies prevents installation on current Debian/Ubuntu releases, as these have started to remove Python2. I also bumped the docker images to depend on 20.04 LTS.