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chore(deps): Upgrade to mocha@5 (#141)

## Summary

- Upgrade mocha 2.5.3 -> 5.2.0

Repro this branch with
```sh
npm install --save-dev mocha@latest
```

Among other things, this addresses the "critical" warning about `growl` visible both here in GitHub and in `npm audit`. The latter is notable because
> npm audit automatically runs when you install a package with npm install

(source: [`npm audit` Getting Started article](https://docs.npmjs.com/getting-started/running-a-security-audit))

For example, expand the `npm install` step of this PR's node 10 build: [link](https://travis-ci.org/optimizely/javascript-sdk/jobs/399773189).
## Test plan
CI

408 of 448 branches covered (91.07%)

Branch coverage included in aggregate %.

3961 of 4051 relevant lines covered (97.78%)

14.66 hits per line