Copyright for haskell-dependent-sum source package in Oracular

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: dependent-sum
Upstream-Contact: James Cook 
Source: https://hackage.haskell.org/package/dependent-sum

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