Kill off a compiler warning

--HG--
extra : amend_source : 16940b0cde9c7160d0642fcbea627c1d4256dc55
Drop ability to equality-compare Collator
Bump version to 0.7
Add changelog
Drop Storable instance for ParseError

--HG--
extra : amend_source : 92bde91def0d876074421a772bd5a8ba55c0f319