Copyright for golang-github-gdamore-tcell source package in Focal

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: tcell
Upstream-Contact: Garrett D'Amore 
Source: https://github.com/gdamore/tcell
Files-Excluded:
  Godeps/_workspace

Files: *
Copyright:
 2015-2018 The TCell Authors
 2015-2018 Garrett D'Amore 
 2015-2018 Zachary Yedidia 
 2015-2018 Junegunn Choi 
 2015-2018 Staysail Systems, Inc. 
 2015 The Tops'l Authors
License: Apache-2.0

Files: debian/*
Copyright: 2018 Paride Legovini 
License: Apache-2.0
Comment: Debian packaging is licensed under the same terms as upstream

License: Apache-2.0
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at
 .
 http://www.apache.org/licenses/LICENSE-2.0
 .
 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 .
 On Debian systems, the complete text of the Apache version 2.0 license
 can be found in "/usr/share/common-licenses/Apache-2.0".