Example app error: Invalid Version

[mikeestrada]

Describe the bug
A clear and concise description of what the bug is.

When running the example app, a required dep is missing: @babel/plugin-proposal-class-properties. However, after manual installation, app build remains broken - see screenshot

To Reproduce
Steps to reproduce the behavior:

git clone https://github.com/glennflanagan/react-collapsible.git
cd react-collapsible/example
yarn && yarn start

React Collapsible JSFiddle Template

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
A clear and concise description of what you expected to happen.

Expected to see all examples in action

Screenshots
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Additional context
Add any other context about the problem here.

Simply trying to mirror the styling shown here (aqua color): https://www.npmjs.com/package/react-collapsible