Unclear instructions in README how to build with stack

I'm trying to build brittany from master using stack, so I checked readme and it says to use:

stack install brittany # --resolver lts-16.31

which doesn't seem correct because obviously current version requires GHC 9.x. I also tried with latest nightly (nightly-2022-01-04) but it doesn't seem to fit as well:

Selected resolver: nightly-2022-01-04
Resolver 'nightly-2022-01-04' does not have all the packages to match your requirements.
    aeson version 1.5.6.0 found
        - brittany requires >=2.0.1 && <2.1
    butcher not found
        - brittany requires >=1.3.3 && <1.4
    data-tree-print not found
        - brittany requires >=0.1.0 && <0.2
    multistate not found
        - brittany requires >=0.8.0 && <0.9
    text version 1.2.4.1 found
        - brittany requires >=1.2.5 && <1.3
    Using package flags:
        - brittany: FlagName "pedantic" = False

Is actually brittany still intended to be built using any existing stack resolver? I know this is probably low priority stuff, but maybe it would be nice to have working stack.yaml to make it easier building brittany using stack, if possible?

Start with the build instructions in README and inspect the project's Stack configuration and package constraints. Check whether an existing Stack resolver can satisfy the dependencies and record the supported build path. Done means the README instructions and stack.yaml, if applicable, describe a working Stack build or clearly state that no resolver is supported.