Move release history into changelog from the cabal file

The cabal file based release history eats up almost a full browser
window of space on the direct-sqlite Hackage page.  Rather than
keeping this long history on the main package page, move it into a
separate changelog file.  Hackage will automatically link to this
changelog file, so that those who're interested in it, can view it
easily without checking out the package contents.
Merge branch 'changelog' of https://github.com/nurpax/direct-sqlite into nurpax-changelog

Conflicts:
	direct-sqlite.cabal