Can't load updated libicu

Not sure if this is the right place for this but when attempting to build `haskell-ide-engine` which relies on `text-icu` as a dependency, it complains about the following:

```
Library not loaded: /usr/local/opt/icu4c/lib/libicuuc.58.dylib
```

However when running `brew install icu4c`, it installs the latest version which is `59.1`. Does support for ICU 59.1 need to be added to `text-icu` or is this issue just unrelated?

More info regarding the error message can be found here https://github.com/haskell/haskell-ide-engine/issues/303.