pypy: give hints about sqlite3
haskell-wreq: disable the test suite to fix the build

https://github.com/NixOS/nixpkgs/pull/3795
haskell-hi: re-generate with cabal2nix
haskell-vty: update to version 5.2.1
haskell-http-conduit: update to version 2.1.4.1
haskell-json-assertions: update to version 1.0.5
haskell-postgresql-simple: update to version 0.4.4.0
haskell-ghc-syb-utils: update to version 0.2.2
haskell-monad-logger: update to version 0.3.7.2