compile to ES5-#19

[j-chimienti]

issues:

fails to build in app as code isn't compiled

changes:

compile code to ES5

see:

https://github.com/balance-io/balance-manager/pull/360

https://github.com/facebook/create-react-app/blob/master/packages/react-scripts/template/README.md#npm-run-build-fails-to-minify