TypeError: execFile is not a function
_I am reporting a bug or issue_

Error thrown when running `npm run render` in any of the examples.

**Expected behavior:**
The project to render in sketch

**Observed behavior:**
Throws error:
```
UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 3): TypeError: execFile is not a function
```

**How to reproduce:**
- clone
- cd to an example directory
- `npm i`
- `npm run render`

**Sketch version:**
48.1

