Require cabal-version 1.8

[felixonmars]

Hopefully this suppresses the following warning:

Warning: readable.cabal:31:27: version operators used. To use version
operators the package needs to specify at least 'cabal-version: >= 1.8'.

[teto]

I see this message too. I approve of the change. I hope we can get ghc 9.2 support too (ready to help).

[mightybyte]

The last change to the cabal file was three years ago, so it doesn't seem like there's anything here that would have caused that warning. Why is narrowing the cabal version the fix to this?

Side note...totally open to PRs supporting more recent GHCs.

[teto]

it's a cabal change most likely. 1.8 should be fine (e.g it's pretty old) considering https://cabal.readthedocs.io/en/3.6/file-format-changelog.html#spec-history

[teto]

any chance we an merge this ?