Leaking global addresses in downstream dep uniqid

[jwalton]

The package macaddress has a global leak in v0.2.8. This appears to be fixed in their master, but they haven't pushed the fix for 9 months.

The package uniqid relies on macaddress, so I'd like to harass them into switching from macaddress to some other package, but they were made aware of this issue six months ago, and they still haven't done anything.

So, I come to you. :) postcss-filter-plugins is a dependency of cssnano, which is a dependency of css-loader, which means quite a few webpack based projects get postcss-filter-plugins as an indirect dependency, and all of those projects will have mysterious test failures if they pass --check-leaks to mocha, so it would be nice to get this fixed. :) Can we replace uniqid with another library easily?

[jwalton]

#15 would fix it perfectly, BTW.

[RyanZim]

Fixed in #19.