data-default-class upper bound

[clinty]

monad-chronicle appears to build fine with data-default-class 0.2.0.0

commercialhaskell/stackage#7545

[phadej]

it builds fine, but it's a breaking change, from one Default to another. I need to think how to deal with this. EDIT: one option to drop Default dependency, it's not really required. It could be disclose :: c -> m ().