Copyright for golang-google-grpc source package in Mantic

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Source: https://github.com/grpc/grpc-go
Upstream-Name: gRPC-Go

Files: *
Copyright: 2014-2019 Google Inc.
           2014-2020 gRPC authors
License: Apache-2.0

Files: debian/*
Copyright: 2015-2016 Dmitry Smirnov 
License: GPL-3+ or Apache-2.0

Files: debian/patches/*
Copyright: 2015-2019 Dmitry Smirnov 
License: GPL-3+ or Apache-2.0
Comment: patches can be licensed under the same terms as upstream.

Files: debian/missing-sources/*
Copyright: 2017-2019 Google Inc.
License: Apache-2.0
Comment: Missing sources for the gRPC protobuf definitions.
 Taken from
   * https://github.com/grpc/grpc-proto/tree/master/grpc
   * https://github.com/googleapis/googleapis/tree/master/google/rpc

License: GPL-3+
 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.
 ․
 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.
 ․
 The complete text of the GNU General Public License version 3
 can be found in "/usr/share/common-licenses/GPL-3".

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
 .
 https://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".