Copyright for ruby-netaddr source package in Focal

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

Files: *
Copyright: (c) Dustin L. Spinhirne 
License: Apache-2.0

Files: debian/*
Copyright: 2016 Thomas Goirand 
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.
 .
 In Debian systems and derivatives, a full version of the Apache-2.0 license is
 available at: /usr/share/common-licenses/Apache-2.0