Install from Hackage fails

Using `stack install vgrep`:

```
Error: While constructing the build plan, the following exceptions were encountered:

In the dependencies for vgrep-0.2.2.0:
aeson-1.4.2.0 from stack configuration does not match (>=0.11 && <1.3) || (>=0.9 && <0.10)
(latest matching version is 1.2.4.0)
cabal-file-th must match >=0.2.3, but the stack configuration has no specified version (latest
matching version is 0.2.6)
needed since vgrep is a build target.

Some different approaches to resolving this:

* Recommended action: try adding the following to your extra-deps
in /Users/austin/.stack/global-project/stack.yaml:

- aeson-1.2.4.0@sha256:2ff56812644c3e272fef6b19aaff1ddab81c9984b1c1f8969521cb856bc22eab,6541
- cabal-file-th-0.2.6@sha256:d278ab950813e8bb1ab242a4e43bc50851761421a1e1bc33dae8949926adf548,1158

Plan construction failed.
```