Upgrade to Babel 7 (#1595)

* Upgrade to Babel 7

* Update dependencies

* Remove `modules` and `useEsModules` as module support is automatically detected

Target browsers supporting ESM in the ESM build.

* Disable corejs aliasing (polyfill)

* Fix package.json and update lockfile

* Bump CircleCI cache version

* Remove `Object.values()` use for Node 6 compatability

* Remove redundant arguments to @babel/register

* Update rollup and rollup-plugin-babel

* Add ignore option to no-transform-runtime-aliasing

Ignore JSON.stringify, parseInt, and ParseFloat

* Upgrade babel-loader to 8.0.1

* Use api.env() in Babel configuration

* Upgrade babel-loader to 8.0.2

test/unicode-spec.js

@@ -110,7 +110,7 @@ describe("unicodeScripts", () => {
     const scriptNames = Object.keys(scriptRegExps);
 
     const allRegExp = new RegExp(
-        Object.values(scriptRegExps).map(re => re.source).join('|')
+        scriptNames.map(script => scriptRegExps[script].source).join('|')
     );
 
     it("supportedCodepoint() should return the correct values", () => {