Dependency update (#50)

* Bump the development-dependencies group with 4 updates (#49)

Bumps the development-dependencies group with 4 updates: [@babel/core](https://github.com/babel/babel/tree/HEAD/packages/babel-core), [@babel/preset-env](https://github.com/babel/babel/tree/HEAD/packages/babel-preset-env), [eslint](https://github.com/eslint/eslint) and [nodemon](https://github.com/remy/nodemon).

* Update deps

* 2.2.4-alpha.1

Author: ammsalme