Upgrade to faker 8

[bmulholland]

I just spent 15 minutes trying to debug because person.fullName wasn't working. It's only available in v8, and v9 is coming along.

See also #134

[ardeois]

Fixed in major version bump 4.0.0
#169

[bmulholland]

Wow that was fast! Thank you <3 <3

[bmulholland]

You gotta laugh hahaha: https://github.com/faker-js/faker/releases/tag/v9.0.0