message: Update year in README
diff: @@ -209,7 +209,7 @@ It will output all documentation under `/dist/doc`.
  ## License
  -Copyright (C) 2017-2019 HERE Europe B.V.
  +Copyright (C) 2017-2020 HERE Europe B.V.
  See the [LICENSE](./LICENSE) file in the root of this project for license details about using `harp.gl`.
  