message: Update copyright
  As per
diff: /*
  -Copyright 2015, 2016 OpenMarket Ltd
  -Copyright 2017 Vector Creations Ltd
  -Copyright 2017, 2018 New Vector Ltd
  Copyright 2019 Michael Telatynski <7t3chguy@gmail.com>
  -Copyright 2019, 2020 The Matrix.org Foundation C.I.C.
  +Copyright 2015 - 2020 The Matrix.org Foundation C.I.C.
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  