Addresses a number of npm audit issues:

`npm audit` reported the following:

```found 11 vulnerabilities (2 low, 2 moderate, 7 high) in 890389 scanned packages
  run `npm audit fix` to fix 9 of them.```

After running `npm audit fix` it reported the following:

```
found 4 vulnerabilities (1 low, 2 moderate, 1 high) in 892586 scanned packages
  2 vulnerabilities require semver-major dependency updates.
  2 vulnerabilities require manual review. See the full report for details.
```