Copyright for asyncfuture source package in Sid

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: asyncfuture
Source: https://github.com/vpicaver/asyncfuture

Files: *
Copyright: 2018-2019 Ben Lau
           2019-2020 Philip Schuchardt
License: Apache2

Files: debian/*
Copyright: 2017 Wookey 
License: Apache2

License: Apache2
 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.
 .
 The text of the Apache 2.0 licence is available on Debian systems under
 /usr/share/common-licenses/Apache-2.0