Updates needed for post-2021

[brody4hire]

updated

• highly recommended: rename default branch to main, which would (possibly) affect the branch name for adding GitHub CI workflows
• add LICENSE file to npm package - done in PR Urgent updates for 2021 #59
• test Babel build output - done in PR Urgent updates for 2021 #59
• use something like jest-matcher-deep-close-to to avoid minor Webpack size variations between Linux, Windows, macOS (etc.) - done in PR Urgent updates for 2021 #59 ... ref:
  • approximatelyDeep jestjs/jest#4058 (comment)
  • Close comparison between float numbers within objects jestjs/jest#3654
• switch from Travis CI to GitHub workflows - done in PR Urgent updates for 2021 #59
• highly recommended: make Webpack optional as I suggested in question: why does it have to depend on webpack? #47 (comment)
• update for recent Webpack v5 release to avoid an issue with Node.js 17 - done in PR Urgent updates for 2021 #59 ... ref:
  • build issue with Node.js 17 react-recompose/react-recompose#13
  • nodejs 17: digital envelope routines::unsupported webpack/webpack#14532 (comment)
  • updating webpack version microsoft/vscode-js-debug#1146
• update more dependencies
• address some other issues

I have already got Webpack v5 working in my work area ... and working with Node.js 17, would be happy to work on the other items (except for renaming the default branch) if anyone is interested.