Harfbuzz version too old

```
$ npm start

> hypervision@0.0.0 start /home/m1574b34r/dev/remote/github.com/mafintosh/hypervision
> npm run build && electron app.js

> hypervision@0.0.0 build /home/m1574b34r/dev/remote/github.com/mafintosh/hypervision
> node build.js

(electron:388): Pango-ERROR **: 16:31:33.495: Harfbuzz version too old (1.2.7)
```

Reproduce the failure with `npm start`, which runs `npm run build` through `build.js` before launching `app.js`. Investigate the reported Pango/Harfbuzz version error and identify whether the Electron runtime or build environment is responsible. Done means the application starts without the Harfbuzz error.

Written by the indexing model from the issue text.