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>

Author: dependabot-preview[bot]

package.json

@@ -36,7 +36,7 @@
   "module": "dist/js/tether.esm.js",
   "devDependencies": {
     "@babel/core": "^7.7.2",
-    "@babel/preset-env": "^7.6.0",
+    "@babel/preset-env": "^7.7.1",
     "@testing-library/jest-dom": "^4.2.3",
     "autoprefixer": "^9.7.1",
     "babel-jest": "^24.9.0",