Warnings when installing with yarn

* `kcd-scripts` version: 0.32.1
* `node` version: 8.9.0
* `npm` (or `yarn`) version: yarn 1.3.2

What you did:

`yarn`

What happened:


Problem description:

Just having a bunch of warnings, does not seem to affect how a module works.

Suggested solution:

Not sure the solution is needed, but Kent said that he's not using yarn, but npm instead, so I figured it wouldn't hurt to make you're aware of this.

No source file or test is identified. Start by reproducing yarn installation with kcd-scripts 0.32.1, Node 8.9.0, and Yarn 1.3.2, then inspect the reported warning output and the dependency configuration. Done means the warnings are either eliminated or clearly identified as harmless and documented.

Written by the indexing model from the issue text.