Fix running-as-script check

[svicalifornia]

This library checks !module.parent to determine whether it is running as a script. When used in the create-react-app webpack environment, module.parent is not set as expected, either via import or require. The lack of value for module.parent causes spurious logging to the console in these React apps.

Per the official Node module docs, we should be checking require.main === module instead. This pull request does just that. With this change, the spurious console logs disappear.

[mike-weshop]

Any chance of this PR getting merged? And should the console.log rather use a logger, so it won't output unless a logger is defined for debugging or other usage?