Add SVG support dependency note

[pnarielwala]

Hello!

It seems like importing SVGs as components does not work with react versions before 16, even with up-to-date react-scripts. Thought this documentation should be updated to include that note.

Thanks!

react@^15.6.2 and [email protected]

import Logo from './logo.svg'
console.log(Logo) // output: /static/media/logo.5d5d9eef.svg

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[iansu]

Thanks!

[ianschmitz]

@iansu it looks like forwardRef was added in React 16.3: https://github.com/facebook/react/blob/master/CHANGELOG.md#1630-march-29-2018

[iansu]

@ianschmitz Thanks. I'll update the docs.