Get rid of uglify.js dependency vulnerability

[KenEucker]

Proposed solution:
This file is a dependency of a dependency within package.json and not explicitly included. Let's see if we can include uglify.js in the package json to resolve this. Otherwise it will have to rely on the initial dependency author to resolve this, or a fork of their code.

What's happening:

This error is showing up in github.

What I expect to happen:
I don't want there to be security vulnerabilities in the project's code or it's dependencies.