Copyright for python-cliff source package in Focal

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: cliff
Upstream-Contact: Doug Hellmann 
Source: https://github.com/dreamhost/cliff

Files: *
Copyright: 2012 Doug Hellmann
           2012 Duncan McGreggor
           2012 Dean Troyer
           2012 Matt Joyce
           2012 Jonathan LaCour
           2012 Mark McClain
License: Apache-2.0

Files: debian/*
Copyright: (c) 2012,2014, Jan Dittberner 
           (c) 2013-2015, Thomas Goirand 
           (c) 2015, James Page
           (c) 2015, Corey Bryant
License: Apache-2.0

License: Apache-2.0
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this software 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 full text of the Apache License, Version 2.0 can be
 found in the file `/usr/share/common-licenses/Apache-2.0'.