no shadowing bom variable js README

Warns the developer he is shadowing a BOM object.

Even though shadowing an object is syntactically right, I made so it's wrong, because there is no way this is allowed:

const document = 5;

This is the error shown:

Do not override a global BOM variable 'document'

It supports all the BOM objects, and works with let or const, here's the list:

• "window"
• "document"
• "navigator"
• "location"
• "history"
• "screen"
• "frames"
• "self"
• "top"
• "parent"

Requirements

Works for javascript.

Known Issues

Using var, instead of let or const doesn't trigger any error. But who uses var anyway...

1.0.0

Initial release.

Enjoy!