Security: bump minimist and node-fetch versions to patch security vulnerabilities

[dbaggott]

Code analysis is identifying a couple of security vulnerabilities in node-fetch and minimist dependencies. The issues have been fixed and upgrading to a more current version of these libraries will resolve the issue.

https://app.snyk.io/vuln/SNYK-JS-NODEFETCH-674311
https://app.snyk.io/vuln/SNYK-JS-MINIMIST-559764

The suggested remediation is:

Upgrade node-fetch to version 2.6.1, 3.0.0-beta.9 or higher.
Upgrade minimist to version 0.2.1, 1.2.3 or higher.

[dbaggott]

The minimist security issue is resolved by #106