Copyright for bdebstrap source package in Noble

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/

Files: *
Copyright: 2017-2020 Benjamin Drung 
License: MIT

Files: tests/test_pylint.py
Copyright: 2010 Stefano Rivera 
           2017-2018 Benjamin Drung 
License: MIT

License: MIT
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 furnished to do so, subject to the following conditions:
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 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.
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