Fix npm package security warnings

To repeat:
```bash
clone testee
npm install
npm i --package-lock-only <-- required to run `npm audit`
npm audit
```

packages with security warnings:
```
mocha (high)
launchpad
miner (high)
qunitjs
babel-plugin-istanbul
```

full npm audit report:
[npm audit.txt](https://github.com/bitovi/testee/files/6167164/npm.audit.txt)

related issues:
https://github.com/bitovi/testee/issues/177
https://github.com/bitovi/testee/issues/175
https://github.com/bitovi/testee/issues/164
https://github.com/bitovi/testee/issues/152

PRs:
https://github.com/bitovi/testee/pull/155