Update methods to be compatible with React.StrictMode

[jpreynat]

This pull request doesn't fix (the following issue) #143 but addresses the removal of now deprecated methods in React 16 to be compatible with <React.StrictMode>.
Since it now uses the getDerivedStateFromProps lifecycle method in its actual state, I set the minimum required version of react and react-dom to ^16.4.0 which includes the bugfix for this method.

I don't have time to improve it better (switching to hooks, etc...) right now, but would be happy to do so when I can find some spare time later.

Pre-Flight Checklist

I have made sure to

• ? make sure this PR is set to merge to the correct X-0-stable branch
• add a Storybook example (if necessary)
• manually test all the Storybook examples
  • run $ yarn run storybook
  • navigate to http://localhost:6006
• run $ yarn run build to build the project code & static example
• check that the example in docs/index.html works: $ yarn run start

[rpearce]

@jpreynat, thanks for bringing up this issue! This will be addressed with #143.

I've now got somebody helping me on this rewrite, though I'm out of office until 17 June.

[jpreynat]

Thanks for the answer @rpearce.
Do you have an ETA for the release? We need to update this module pretty quick to use React's concurrent mode, so any update would be appreciated.

[rpearce]

@jpreynat No, and I don't suspect it will be released for a while. Given this, I'll review this PR fully before end of next week. I'm currently out of office officially until the 17th, as my wife and I are moving continents, but I'll make some time for this.

[jpreynat]

Thanks for the quick update @rpearce. Let me know if you have any feedback on the PR.
In the meantime, good luck with the moves.

[rpearce]

@jpreynat I'm back and settled in the USA and back at work. This will happen ASAP (I'll review tonight or tomorrow)

[jpreynat]

Great, thanks for the update!

[rpearce]

Code looking good! Need to go through all the storybook and build stuff and make sure

[rpearce]

If all is well when I test tomorrow, then I'll ship tomorrow

[rpearce]

Looks good, my friend! There are going to be massssssssssive changes coming down the pipeline to redo basically everything in the coming months. For now, I will:

1. merge this
2. update the changelog accordingly
3. add you to the All Contributors list
4. publish
5. check back here

Thank you for your patience and contribution. If you have any other desires for this library, please create an Issue, and I'll consider it for the rewrite!

[rpearce]

@jpreynat this has been published as 3.1.0. Please let me know if you have any issues.

[jpreynat]

Thanks @rpearce for the fast release.
I will keep you updated if anything goes wrong as soon as I've tested it.