resolver: lts-13.0

# The LTS 13.0 resolver uses the GHC 8.6.3 compiler. Unfortunately GHC 8.6.3
# has a bug on Windows that prevents Template Haskell splices from running.
# This package uses TH splices extensively and needs to build on Windows, so
# that's a problem. Fortunately Using the same resolver with an older compiler
# fixes the problem. Once either GHC 8.6.4 or 8.8.1 are released this project
# can go back to using the compiler provided by the resolver.
compiler: ghc-8.6.2 # https://github.com/tfausak/rattletrap/issues/108