Pin data-default-class to >=0.2.0.0 and crypton-connection >=0.4.2 to avoid incompatibility issues

[danwdart]

Making sure that older versions of data-default-class aren't accepted, and make sure that we are using the crypton-connection version that works properly with this.

Technically this could be a cabal metadata update if you don't feel like a new PR.

Fixes #179.

Cheers!

[sternenseemann]

This forbids a previously working combination of data-default-class and crypton-connection. This specific combination being broken is quite unfortunate since it is the one prescribed by Stackage LTS. If you use Stackage LTS bounds and pull in Hackage revisions, this package breaks. I don't really understand why req has to solve this problem, shouldn't crypton-connection or data-default have the right bounds? req is downstream from these packages and shouldn't need to concern itself with the question whether they are compatible with each other.

Stackage LTS 23 has

• req-3.13.4
• crypton-connection-0.4.3
• data-default-class-0.1.2.2
• data-default-0.7.1.3