TypeError: context.compiler.plugin is not a function

Hello @danielstern

I'm getting this error trying to run the app. Can you help me out, please? Thanks

```
npm -v: 6.14.10
node -v: v14.15.4
```

```
npm run start-dev

> isomorphic-react@1.0.0 start-dev /Users/denistoledo/Dev/testing-react-applications-with-jest
> cross-env NODE_ENV=development babel-node server --useServerRender=false --useLiveData=false

Warning: Please use `require("history").createMemoryHistory` instead of `require("history/createMemoryHistory")`. Support for the latter will be removed in the next major release.
/Users/denistoledo/Dev/testing-react-applications-with-jest/node_modules/webpack-dev-middleware/lib/Shared.js:233
context.compiler.plugin("done", share.compilerDone);
^

TypeError: context.compiler.plugin is not a function
```