CircleCI build failing

[jml]

Probably need to switch to explicit stackage version.

https://circleci.com/gh/jml/servant-template/29

$ stack install hlint
Writing implicit global project config file to: /home/ubuntu/.stack/global-project/stack.yaml
Note: You can change the snapshot via the resolver field there.
Using latest snapshot resolver: lts-9.6
Downloading lts-9.6 build plan ...����������������������������������                                  ����������������������������������Downloaded lts-9.6 build plan.
...
No compiler found, expected minor version match with ghc-8.0.2 (x86_64) (based on resolver setting in /home/ubuntu/.stack/global-project/stack.yaml).
To install the correct GHC into /home/ubuntu/.stack/programs/x86_64-linux/, try running "stack setup" or use the "--install-ghc" flag. To use your system GHC installation, run "stack config set system-ghc --global true", or use the "--system-ghc" flag.