Bump @babel/preset-env from 7.6.3 to 7.7.1

Bumps [@babel/preset-env](https://github.com/babel/babel) from 7.6.3 to 7.7.1.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/master/CHANGELOG.md)
- [Commits](babel/babel@v7.6.3...v7.7.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -49,7 +49,7 @@
   "devDependencies": {
     "@babel/cli": "^7.6.4",
     "@babel/core": "^7.6.4",
-    "@babel/preset-env": "^7.6.3",
+    "@babel/preset-env": "^7.7.1",
     "@typescript-eslint/eslint-plugin": "^2.6.1",
     "@typescript-eslint/parser": "^2.6.0",
     "ava": "^2.4.0",