Copyright for haskell-failure source package in Focal

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: failure
Upstream-Contact: Pepe Iborra 
Source: https://hackage.haskell.org/package/failure

Files: *
Copyright: Pepe Iborra
           Michael Snoyman
           Nicolas Pouillard
License: BSD-3-clause

Files: debian/*
Copyright: held by the contributors mentioned in debian/changelog
License: BSD-3-clause

License: BSD-3-clause
 Redistribution and use in source and binary forms, with or without modification,
 are permitted provided that the following conditions are met:
 .
     1. Redistributions of source code must retain the above copyright notice,
        this list of conditions and the following disclaimer.
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     2. Redistributions in binary form must reproduce the above copyright
        notice, this list of conditions and the following disclaimer in the
        documentation and/or other materials provided with the distribution.
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     3. Neither the name of author nor the names of its contributors may be used
        to endorse or promote products derived from this software without
        specific prior written permission.
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 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
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 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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