chore(deps): bump babel to v8 (#148)

Upgrade @babel/cli and @babel/core to 8.0.1 and @babel/preset-env to
8.0.2. Remove the `loose: true` preset-env option (dropped in v8; use
granular assumptions instead) and bump the import-extension plugin's
version assertion to `api.assertVersion(8)`.

Author: char0n

babel.config.cjs

@@ -10,7 +10,6 @@ module.exports = {
           {
             debug: false,
             modules: "commonjs",
-            loose: true,
             useBuiltIns: false,
             forceAllTransforms: false,
             ignoreBrowserslistConfig: false,