Error with using babel-preset-env instead of babel-preset-es2015

When using material-design-icons with Babel and ESNext, I'm getting an error. This is caused by the preset in your .babelrc published with your npm-package (running 3.0.1). Babel meanwhile deprecated the usage of babel-preset-es2015 and encourages users to switch to babel-preset-env, see: babeljs.io/env

I could fix this by installing babel-preset-env and changing your .babelrc from:
`{ "presets": ["es2015"] }` to `{ "presets": ["env"] }`

For now users can roll on with keeping babel-preset-es2015 in the package.json.

Start by inspecting the published .babelrc and package.json in version 3.0.1, then compare their Babel preset configuration with the reported babel-preset-env change. Confirm that the package builds and consumers no longer require the deprecated es2015 preset; the issue does not mention a test file.

Written by the indexing model from the issue text.