Request: Allow Passing Custom User-Agent Through Config

[andersoonluan]

I'd like the ability to pass my own user-agent string through the configuration settings. This would provide greater flexibility for users who need to set specific user-agent strings for their requests.

Currently user agent is defined here

linkinator/src/index.ts

Line 63 in a530c40

'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.117 Safari/537.36',

but in some scenarios I'd prefer to pass my own user agent for internal purposes.

Do we have this possibility today? Are you OK if I open a PR contributing with this functionality?

Thank you!