`sudo servor --secure` throws `EACCES: permission denied`

Nobody has claimed this yet.

I'm trying to [install the certs](https://www.npmjs.com/package/servor#adding-credentials-to-the-trusted-store) so that I won't see the "⚠️ Your connection is not private" screen.

I ran `sudo npm i -g servor` then `sudo servor --secure`, and it threw and error saying

```
(node:4316) UnhandledPromiseRejectionWarning: Error: EACCES: permission denied, uv_cwd
at module.exports (/Users/me/.nvm/versions/node/v10.20.1/lib/node_modules/servor/servor.js:38:58)
at process._tickCallback (internal/process/next_tick.js:68:7)
at Function.Module.runMain (internal/modules/cjs/loader.js:834:11)
at startup (internal/bootstrap/node.js:283:19)
at bootstrapNodeJSCore (internal/bootstrap/node.js:623:3)
(node:4316) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 2)
(node:4316) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
```

I'm on macOS Catalina 10.15.5 (19F96).
`npm -v` 6.14.4
`node -v` v10.20.1
`servor` 4.0.2

Start at servor.js:38, where the stack trace reports the EACCES uv_cwd failure, and reproduce `sudo servor --secure` with the reported Node.js 10.20.1, npm 6.14.4, and macOS Catalina versions. Check the secure certificate-installation path described in the issue. Done means the command no longer throws the permission error and the reported secure-server flow works.

Written by the indexing model from the issue text.