[readme] add github actions/codecov badges; update description

Author: ljharb

README.md

@@ -1,16 +1,17 @@
 # array.prototype.flatmap <sup>[![Version Badge][npm-version-svg]][package-url]</sup>
 
-[![Build Status][travis-svg]][travis-url]
+[![github actions][actions-image]][actions-url]
+[![coverage][codecov-image]][codecov-url]
 [![dependency status][deps-svg]][deps-url]
 [![dev dependency status][dev-deps-svg]][dev-deps-url]
 [![License][license-image]][license-url]
 [![Downloads][downloads-image]][downloads-url]
 
 [![npm badge][npm-badge-png]][package-url]
 
-An ESnext spec-compliant `Array.prototype.flatMap` shim/polyfill/replacement that works as far down as ES3.
+An ES2019 spec-compliant `Array.prototype.flatMap` shim/polyfill/replacement that works as far down as ES3.
 
-This package implements the [es-shim API](https://github.com/es-shims/api) interface. It works in an ES3-supported environment and complies with the proposed [spec](https://tc39.github.io/proposal-flatMap/).
+This package implements the [es-shim API](https://github.com/es-shims/api) interface. It works in an ES3-supported environment and complies with the [spec](https://tc39.es/ecma262/#sec-array.prototype.flatmap).
 
 Because `Array.prototype.flatMap` depends on a receiver (the `this` value), the main export takes the array to operate on as the first argument.
 
@@ -65,15 +66,17 @@ assert.deepEqual(arr.flatMap(mapper), flatMap(arr, mapper));
 Simply clone the repo, `npm install`, and run `npm test`
 
 [package-url]: https://npmjs.org/package/array.prototype.flatmap
-[npm-version-svg]: http://versionbadg.es/es-shims/Array.prototype.flatMap.svg
-[travis-svg]: https://travis-ci.org/es-shims/Array.prototype.flatMap.svg
-[travis-url]: https://travis-ci.org/es-shims/Array.prototype.flatMap
+[npm-version-svg]: https://versionbadg.es/es-shims/Array.prototype.flatMap.svg
 [deps-svg]: https://david-dm.org/es-shims/Array.prototype.flatMap.svg
 [deps-url]: https://david-dm.org/es-shims/Array.prototype.flatMap
 [dev-deps-svg]: https://david-dm.org/es-shims/Array.prototype.flatMap/dev-status.svg
 [dev-deps-url]: https://david-dm.org/es-shims/Array.prototype.flatMap#info=devDependencies
 [npm-badge-png]: https://nodei.co/npm/array.prototype.flatmap.png?downloads=true&stars=true
-[license-image]: http://img.shields.io/npm/l/array.prototype.flatmap.svg
+[license-image]: https://img.shields.io/npm/l/array.prototype.flatmap.svg
 [license-url]: LICENSE
-[downloads-image]: http://img.shields.io/npm/dm/array.prototype.flatmap.svg
-[downloads-url]: http://npm-stat.com/charts.html?package=array.prototype.flatmap
+[downloads-image]: https://img.shields.io/npm/dm/array.prototype.flatmap.svg
+[downloads-url]: https://npm-stat.com/charts.html?package=array.prototype.flatmap
+[codecov-image]: https://codecov.io/gh/es-shims/Array.prototype.flatMap/branch/main/graphs/badge.svg
+[codecov-url]: https://app.codecov.io/gh/es-shims/Array.prototype.flatMap/
+[actions-image]: https://img.shields.io/endpoint?url=https://github-actions-badge-u3jn4tfpocch.runkit.sh/es-shims/Array.prototype.flatMap
+[actions-url]: https://github.com/es-shims/Array.prototype.flatMap/actions

package.json

@@ -16,7 +16,7 @@
 			"url": "http://ljharb.codes"
 		}
 	],
-	"description": "An ESnext spec-compliant `Array.prototype.flatMap` shim/polyfill/replacement that works as far down as ES3.",
+	"description": "An ES2019 spec-compliant `Array.prototype.flatMap` shim/polyfill/replacement that works as far down as ES3.",
 	"license": "MIT",
 	"main": "index",
 	"scripts": {