Copyright for haskell-th-extras source package in Bionic

Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: th-extras
Upstream-Contact: James Cook 
Source: http://hackage.haskell.org/package/th-extras

Files: *
Copyright: No copyright asserted, files are in the PublicDomain
License: public-domain