Updated the copyright year in README.md to 2021 (#433)
Updated the copyright year in README.md to 2021 (#433)


mdenker/elephant,NeuralEnsemble/elephant,NeuralEnsemble/elephant,INM-6/elephant,NeuralEnsemble/elephant,mdenker/elephant,INM-6/elephant,INM-6/elephant,mdenker/elephant