Bumps Stackage LTS resolver

[jkachmar]

This bumps psc-package to build with the latest Stackage LTS (lts-14.23 at the time of writing).

This should resolve #157 since lts-14.23 includes aeson-pretty-0.8.8, although I'm not able to reproduce this as I'm not on Windows.

In case someone else is interested in trying this out on Windows, here's a link to the purescript-book fork at a commit that should surface the same error as reported in #157:

https://github.com/dwhitney/purescript-book/blob/51ac437475ae8b72f2cf9291c32785af4f5ba394/exercises/chapter3

[jkachmar]

Oh right, there's an AppVeyor integration here. I suppose I could add a small test case that checks whether or not that particular psc-package.json fails if you'd like.

[justinwoo]

Supposedly this comes up in sharkdp/insect#219, but only for some users. Probably has something to do with what your git config is for handling newlines.

[justinwoo]

Remind me to try to merge this when this passes the build and all, which might take forever because toasters and Haskell are a match made in hell