yargs needed for CLI

[mgifford]

I tried to run the CLI with using Node.js v20.0.0:

% node cli.js -c -u https://www.va.gov

Got this error:

node:internal/errors:490
   ErrorCaptureStackTrace(err);
   ^

Error [ERR_MODULE_NOT_FOUND]: Cannot find module '/Users/mgifford/node_modules/yargs/helpers' imported from /Users/mgifford/purple-hats/cli.js
...

I think this resolved the problem:

% npm install yargs

[younglim]

Hey @mgifford, I have upgraded Node to LTS 20.10.0 and depebumped dependency version and did not find yargs missing. You may wish to try the latest commit from master.

#242