Use babel-preset-env instead of babel-preset-es2015

[php-coder]

We need to address the following warning:

[INFO] --- frontend-maven-plugin:1.7.6:npm (default-cli) @ mystamps ---
[INFO] Running 'npm install babel-cli babel-preset-es2015 babel-preset-react --save-dev' in /Users/coder/git/mystamps.git/src/main/frontend
[WARNING] npm WARN deprecated babel-preset-es2015@6.24.1: 🙌 Thanks for using Babel: we recommend using babel-preset-env now: please read https://babeljs.io/env to update!

Tech debt for: 054acbc (#1060)