[ANN] GHCup 0.2.2.0 release

hasufell:

• cabal install <ghc-ver> is gone, use cabal install ghc <ghc-ver>
• cabal install-cabal <cabal-ver> is gone, use cabal install cabal <cabal-ver>

Did you mean to write ghcup install ... here, or is there some cabal-GHCup-integration that I wasn’t aware of yet?