Doesn't work with Synology nginx as it doesn't have a name

## Environment

* Operating system (including version): macOS
* mkcert version (from `mkcert -version`): 1.4.4
* Server (where the certificate is loaded): Synology
* Client (e.g. browser, CLI tool, or script): Synology

## What you did

I can import the certificates into Synology's nginx UI. It loads okay

## What went wrong

The problem occurs as the certificate generated doesn't have a name. so you can add domains and subdomains with Synology's UI. I propose that it just ads a title/name to the certificate.