/pure build throws in browsers not supporting async-await

More of a problem with `kcd-scripts` but I'm filing it here since the use case is more obvious. Feel free to transfer the issue.



- `react-testing-library` version: 9.1.4

- `react` version: N/A

- `node` version: N/A

- `npm` (or `yarn`) version: N/A



### Relevant code or config:



```js

import '@testing-library/react/pure'

```



### What you did:



Used `@testing-library/react` in IE11



### What happened:



Threw with `unexpected identifier` (due to async-await)



### Reproduction:



https://github.com/mui-org/material-ui/pull/17165/commits/1e54d497d94b68d3ea594ac83fa3d2e62ab8026c 



failing build: https://circleci.com/gh/mui-org/material-ui/113431



### Problem description:



`kcd-scripts build` will use babel but ignore any `browserslists` assuming the target is `node: 8`. [Only rollup and webpack bundles will load browserslist](https://github.com/kentcdodds/kcd-scripts/blob/bd3c762c0202ac3564bb6a329e3e9e972795b5e7/src/config/babelrc.js#L40)



### Suggested solution:



Add a browserslist targetting ie 11, node 8 and the last 3 versions of the evergreen browsers as well as:



No special case for babel `targets`. It should always use `.browserslistrc` since that supports a `node` entry as well. I think it didn't use to support a node version since I occasionally encounter a repository using browserslist but throwing with a node entry.

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