Copyright for python-async-timeout source package in Huanghe V3.0

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: async_timeout
Upstream-Contact: Andrew Svetlov 
Source: https://github.com/aio-libs/async_timeout/

Files: *
Copyright: Andrew Svetlov 
License: Apache2

Files: debian/*
Copyright: 2016 © Piotr Ożarowski 
License: Apache2

License: Apache2
 See /usr/share/common-licenses/Apache-2.0