[addon-notes] console warning (Each child in a list should have a unique "key" prop)

Describe the bug When using the Notes Addon, there’s a React console warning:

vendors~main.608b7bf874843e30ef63.bundle.js:88356 Warning: Each child in a list should have a unique "key" prop.

Check the top-level render call using <Styled(div)>. See https://fb.me/react-warning-keys for more information.
    in NotesPanel
    in Unknown
    in Unknown
    in Unknown
    in Unknown (created by Context.Consumer)
    in ManagerConsumer (created by _default)
    in _default (created by Layout)
    in div (created by Context.Consumer)
    in Styled(div) (created by Panel)
    in Panel (created by Layout)
    in div (created by Context.Consumer)
    in Styled(div) (created by Main)
    in div (created by Context.Consumer)
    in Styled(div) (created by Main)
    in Main (created by Layout)
    in Layout (created by Context.Consumer)
    in WithTheme(Layout)
    in Unknown
    in Unknown (created by ResizeDetector)
    in ChildWrapper (created by ResizeDetector)
    in ResizeDetector
    in div (created by Context.Consumer)
    in Styled(div)
    in Unknown
    in Unknown (created by Manager)
    in ThemeProvider (created by Manager)
    in Manager (created by Context.Consumer)
    in Location (created by QueryLocation)
    in QueryLocation (created by Root)
    in LocationProvider (created by Root)
    in HelmetProvider (created by Root)
    in Root

To Reproduce Steps to reproduce the behavior:

1. Install and enable the Notes Addon following the default readme instructions
2. Run Storybook
3. Open the console
4. See error

Expected behavior No console warning.

System:

• OS: [MacOS]
• Device: [Macbook Pro 2018]
• Browser: [Chrome]
• Framework: [React]
• Addons: [Notes]
• Version: [e.g. 5.1.3]

[SQReder]

bump

[mtmacdonald]

Issue is still unresolved for me. I think it’s important for release quality that console warnings are fixed, because this tool is used for component testing, and if the tool itself is giving warnings it doesn’t look great.