Prevent "not implemented" error being logged in jsdom and general repository maintenance

[srmagura]

When importing is-emoji-supported in jsdom (Jest), the following is logged via console.error:

    Error: Not implemented: HTMLCanvasElement.prototype.getContext (without installing the canvas npm package)
        at module.exports (/Users/srmagura/Documents/oss/emoji-mart/node_modules/jsdom/lib/jsdom/browser/not-implemented.js:9:17)
        at HTMLCanvasElementImpl.getContext (/Users/srmagura/Documents/oss/emoji-mart/node_modules/jsdom/lib/jsdom/living/nodes/HTMLCanvasElement-impl.js:42:5)
        at HTMLCanvasElement.getContext (/Users/srmagura/Documents/oss/emoji-mart/node_modules/jsdom/lib/jsdom/living/generated/HTMLCanvasElement.js:131:58)
        at /Users/srmagura/Documents/oss/emoji-mart/node_modules/is-emoji-supported/src/is-emoji-supported.ts:47:44
        at Object.<anonymous> (/Users/srmagura/Documents/oss/emoji-mart/node_modules/is-emoji-supported/src/is-emoji-supported.ts:107:2)
        at Runtime._execModule (/Users/srmagura/Documents/oss/emoji-mart/node_modules/jest-runtime/build/index.js:1691:24)
        at Runtime._loadModule (/Users/srmagura/Documents/oss/emoji-mart/node_modules/jest-runtime/build/index.js:1222:12)
        at Runtime.requireModule (/Users/srmagura/Documents/oss/emoji-mart/node_modules/jest-runtime/build/index.js:1046:12)
        at Runtime.requireModuleOrMock (/Users/srmagura/Documents/oss/emoji-mart/node_modules/jest-runtime/build/index.js:1247:21)
        at Runtime.loadCjsAsEsm (/Users/srmagura/Documents/oss/emoji-mart/node_modules/jest-runtime/build/index.js:853:22) {
      type: 'not implemented'
    }

While this does not cause tests to fail, people may waste time trying to fix this error. In both of the repositories where I'm seeing this error, it's not possible to suppress the error via Jest module mocking. So it made the most sense to fix it here.

I set up Jest in the repository so I could write a test that asserts console.error is not called when importing is-emoji-supported.ts.

General repository maintenance changes:

• Upgraded most devDependencies to the latest version.
• The repository contained both yarn.lock and package-lock.json, which is confusing for developers who are new to the project. I removed yarn.lock since the README said to run tests using npm.

By the way

If you like these changes and need help maintaining this repository, feel free to add me as a contributor. Just saying this because I cannot tell if this repository is abandoned, or if there has just been no recent work on it because there were no issues.