Urgent updates for 2021

[brodybits]

updated:

• update tests to pass consistently on major supported platforms Linux, Windows, and macOS, with help from jest-matcher-deep-close-to
• switch to GitHub CI for testing ... tested in PRs on my fork:
  • ci: switch to GitHub workflow for testing brodybits/rollup-plugin-size-snapshot#1
  • fix(ci): test on Node.js 10 brodybits/rollup-plugin-size-snapshot#2
• update Webpack to v5 ... tested in PR on my fork:
  • update webpack to v5 brodybits/rollup-plugin-size-snapshot#3
• add LICENSE to generated npm package
• test output of Babel build ... tested on my fork:
  • Urgent upstream updates 2021 brodybits/rollup-plugin-size-snapshot#5
• build & test with multiple versions of Rollup
• remove flow-typed items (seem to be obsolete & not needed)
• update some other dependencies & devDependencies

I think this needs a new 0.x version due to the nature of switching to Webpack v5.

Motivation:

• build issue with Node.js 17 react-recompose/react-recompose#13
• Updates needed for post-2021 #58

I had to apply an ugly workaround to get react-recompose CI working on Node.js 17, would like to get it fixed in this Rollup plugin if possible.

I would be happy to break this down to multiple PRs or combine some of the proposed commits if needed to get this reviewed and hopefully merged.

Thanks in advance!

[brodybits]

@TrySound is there any chance you would be willing to consider some of the updates that I had proposed?

Is there anything we can do to help make this happen?

I would be happy to split this into multiple PRs if needed.

I did start maintaining my own fork to solve an issue with testing react-recompose on Node.js 17, hope it can go away (someday).

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Thanks in advance for your consideration.

I think the most important things are to get this working with GitHub CI workflows and update to Webpack 5.