Copyright for node-chainsaw source package in Focal

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

Files: *
Copyright: James Halliday 
License: Expat
Comment: The upstream distribution does not contain an explicit statement of
 copyright ownership. Pursuant to the Berne Convention for the Protection of
 Literary and Artistic Works, it is assumed that all content is copyright by
 its respective authors unless otherwise stated.

Files: debian/*
Copyright: 2012, David Paleino 
 2020, Xavier Guimard 
License: Expat

License: Expat
 Permission is hereby granted, free of charge, to any person obtaining a
 copy of this software and associated documentation files (the
 "Software"), to deal in the Software without restriction, including
 without limitation the rights to use, copy, modify, merge, publish,
 distribute, sublicense, and/or sell copies of the Software, and to
 permit persons to whom the Software is furnished to do so, subject to
 the following conditions:
 .
 The above copyright notice and this permission notice shall be included
 in all copies or substantial portions of the Software.
 .
 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 .
 Except as contained in this notice, the name(s) of the above copyright
 holders shall not be used in advertising or otherwise to promote the
 sale, use or other dealings in this Software without prior written
 authorization.