Copyright for python-asttokens source package in Lunar

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: asttokens
Upstream-Contact: Dmitry Sagalovskiy, Grist Labs 
Source: https://pypi.org/project/asttokens

Files: *
Copyright: 2016 Grist Labs, Inc.
License: Apache-2.0

Files: debian/*
Copyright: 2019 Dominik George 
License: Apache-2.0

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, ypu can find the full text of the license under
 /usr/share/common-licenses/Apache-2.0 .