message: update copywrite for 2020 [ci skip]
diff: #
  -# Copyright 2013-2019 the original author or authors from the JHipster project.
  +# Copyright 2013-2020 the original author or authors from the JHipster project.
  #
  # This file is part of the JHipster project, see https://www.jhipster.tech/
  # for more information.
  