docs: Add 2020 papers to README.md (#299)
docs: Add 2020 papers to README.md (#299)

Co-authored-by: Antonius Weinzierl <365570c6e44179b601e90cc08fd7c5ab9f93d143@users.noreply.github.com>
alpha-asp/Alpha,alpha-asp/Alpha,AntoniusW/Alpha