Can't get emotion example to build
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**Expected behavior:**
running `yarn` or `npm install` to work on the `emotion` example

**Observed behavior:**
Long error but basically 

```
error Error while building ./my-command.js
./node_modules/react-sketchapp/lib/module/buildTree.js
Module not found: Error: Can't resolve 'react-test-renderer' in '/Users/localuser/code/github/react-sketchapp/examples/emotion/node_modules/react-sketchapp/lib/module'
```

**How to reproduce:**
running `yarn` or `npm install` on the `emotion` example

**Sketch version:**
70.6

**Please attach screenshots, a zip file of your project, and/or a link to your github project**
Use `examples/emotion`